- Published on
Toxicology – Synthetic Cannabinoids (“Spice,” “K2”)
Source
Synthetic cannabinoids are laboratory-made compounds sprayed onto plant material and sold as “herbal incense” or “smoking blends.” These products are often marketed in colorful packaging and labeled “not for human consumption,” despite being used recreationally.
Typical Presentation
Users may develop symptoms shortly after smoking these substances. A common presentation includes sudden onset of anxiety, paranoia, and altered perception, sometimes progressing to severe psychological distress.
Clinical Features
While some effects resemble natural cannabis, synthetic cannabinoids are more likely to cause severe neuropsychiatric symptoms such as intense anxiety, paranoia, hallucinations, delusions, and psychosis. Other findings may include tachycardia, agitation, and confusion. Serious complications such as seizures, myocardial infarction, acute kidney injury, and self-harm have been reported.
Mechanism of Action
These compounds act on cannabinoid receptors (CB1 and CB2), similar to THC. However, their potency, receptor affinity, and concentration vary widely, leading to unpredictable and often more severe effects compared to natural cannabis.
Management
Treatment is supportive. Benzodiazepines are commonly used to manage agitation, anxiety, tachycardia, and hallucinations.
Key Points
Source
Synthetic cannabinoids are laboratory-made compounds sprayed onto plant material and sold as “herbal incense” or “smoking blends.” These products are often marketed in colorful packaging and labeled “not for human consumption,” despite being used recreationally.
Typical Presentation
Users may develop symptoms shortly after smoking these substances. A common presentation includes sudden onset of anxiety, paranoia, and altered perception, sometimes progressing to severe psychological distress.
Clinical Features
While some effects resemble natural cannabis, synthetic cannabinoids are more likely to cause severe neuropsychiatric symptoms such as intense anxiety, paranoia, hallucinations, delusions, and psychosis. Other findings may include tachycardia, agitation, and confusion. Serious complications such as seizures, myocardial infarction, acute kidney injury, and self-harm have been reported.
Mechanism of Action
These compounds act on cannabinoid receptors (CB1 and CB2), similar to THC. However, their potency, receptor affinity, and concentration vary widely, leading to unpredictable and often more severe effects compared to natural cannabis.
Management
Treatment is supportive. Benzodiazepines are commonly used to manage agitation, anxiety, tachycardia, and hallucinations.
Key Points
- Synthetic cannabinoids are typically not detected on standard drug screening tests.
- Numerous compounds exist, including JWH-018, JWH-073, CP-47,497, HU-210, and cannabicyclohexanol, contributing to variable toxicity profiles.
- Published on
Toxicology – Synthetic Cathinones (“Bath Salts”)
Source
“Bath salts” refer to synthetic stimulant drugs derived from cathinones, compounds related to substances found in the khat plant (Catha edulis), native to East Africa and the Middle East. These products are often sold in retail settings under misleading names and packaging.
Typical Presentation
Use typically occurs in social or party settings, where individuals may repeatedly take the substance. This can lead to escalating toxicity, including severe agitation and psychotic behavior, sometimes resulting in harm to self or others.
Clinical Features
These agents produce a sympathomimetic toxidrome characterized by agitation, hallucinations, paranoia, tremors, hyperreflexia, nausea, vomiting, tachycardia, hypertension, dilated pupils, and sweating. Severe complications may include violent behavior, rhabdomyolysis, acute kidney injury, myocardial infarction, and self-harm.
Mechanism of Action
Synthetic cathinones act similarly to amphetamines by increasing levels of serotonin, dopamine, and norepinephrine in the brain, leading to marked central nervous system stimulation.
Management
Treatment is supportive. Benzodiazepines are first-line therapy for agitation, anxiety, and tachycardia. In severe cases, physical or chemical restraints may be required to ensure safety.
Key Points
Source
“Bath salts” refer to synthetic stimulant drugs derived from cathinones, compounds related to substances found in the khat plant (Catha edulis), native to East Africa and the Middle East. These products are often sold in retail settings under misleading names and packaging.
Typical Presentation
Use typically occurs in social or party settings, where individuals may repeatedly take the substance. This can lead to escalating toxicity, including severe agitation and psychotic behavior, sometimes resulting in harm to self or others.
Clinical Features
These agents produce a sympathomimetic toxidrome characterized by agitation, hallucinations, paranoia, tremors, hyperreflexia, nausea, vomiting, tachycardia, hypertension, dilated pupils, and sweating. Severe complications may include violent behavior, rhabdomyolysis, acute kidney injury, myocardial infarction, and self-harm.
Mechanism of Action
Synthetic cathinones act similarly to amphetamines by increasing levels of serotonin, dopamine, and norepinephrine in the brain, leading to marked central nervous system stimulation.
Management
Treatment is supportive. Benzodiazepines are first-line therapy for agitation, anxiety, and tachycardia. In severe cases, physical or chemical restraints may be required to ensure safety.
Key Points
- These substances are often not detected on standard drug screening tests.
- Common compounds include MDPV, methylone, and mephedrone.
- Published on
Toxicology – Dextromethorphan (DXM) Toxicity
Source
Dextromethorphan is a synthetically produced compound found in many over-the-counter cough and cold medications, available in both liquid and tablet forms.
Typical Presentation
Misuse often involves ingestion of large quantities of cough syrup or tablets, particularly among adolescents. Patients may present with confusion, disorientation, or abnormal behavior following excessive intake.
Clinical Features
Effects are dose-dependent. At therapeutic levels, DXM acts as a cough suppressant. In higher doses, it can produce euphoria, agitation, hypertension, tachycardia, hyperthermia, sweating, hallucinations, and dissociative states. Severe toxicity may result in unresponsiveness and sensory detachment. When combined with serotonergic agents such as SSRIs or MAO inhibitors, serotonin syndrome may develop.
Mechanism of Action
DXM is metabolized into dextrorphan, its active metabolite. This compound acts on sigma opioid receptors to suppress cough. At higher doses, it blocks NMDA receptors and inhibits reuptake of monoamines, leading to dissociative and sympathomimetic effects. Unlike traditional opioids, it does not significantly affect μ or δ receptors, so classic opioid toxicity is not typically observed.
Management
Treatment is primarily supportive. Naloxone may provide partial benefit in some cases, although its effects are variable.
Key Points
Source
Dextromethorphan is a synthetically produced compound found in many over-the-counter cough and cold medications, available in both liquid and tablet forms.
Typical Presentation
Misuse often involves ingestion of large quantities of cough syrup or tablets, particularly among adolescents. Patients may present with confusion, disorientation, or abnormal behavior following excessive intake.
Clinical Features
Effects are dose-dependent. At therapeutic levels, DXM acts as a cough suppressant. In higher doses, it can produce euphoria, agitation, hypertension, tachycardia, hyperthermia, sweating, hallucinations, and dissociative states. Severe toxicity may result in unresponsiveness and sensory detachment. When combined with serotonergic agents such as SSRIs or MAO inhibitors, serotonin syndrome may develop.
Mechanism of Action
DXM is metabolized into dextrorphan, its active metabolite. This compound acts on sigma opioid receptors to suppress cough. At higher doses, it blocks NMDA receptors and inhibits reuptake of monoamines, leading to dissociative and sympathomimetic effects. Unlike traditional opioids, it does not significantly affect μ or δ receptors, so classic opioid toxicity is not typically observed.
Management
Treatment is primarily supportive. Naloxone may provide partial benefit in some cases, although its effects are variable.
Key Points
- Many DXM-containing products also include acetaminophen, so levels should be checked in suspected overdose.
- DXM is sometimes misused as a recreational substance and marketed as an alternative to other psychoactive drugs.
- Certain formulations (e.g., combination cold medications) are commonly abused for their DXM content.
- Chronic use may lead to bromide toxicity, particularly with tablet formulations.
- DXM can cause false-positive results for PCP on urine drug screens.
- Published on
Toxicology – Inhalant Abuse (“Huffing”)
Source
Inhalant abuse involves breathing in vapors from volatile substances such as gasoline (hydrocarbons), aerosol sprays and computer dusters (halogenated hydrocarbons), nail polish remover (ketones), lighter fluid (butane), spray paints (toluene), nitrites (“poppers”), and nitrous oxide from whipped cream canisters.
Typical Presentation
Patients are often adolescents found with evidence of inhalant use, such as chemical-soaked materials. They may present with altered consciousness or unresponsiveness after exposure.
Clinical Features
Symptoms vary depending on the substance but may include skin flushing, irritation of the eyes and airways, poor coordination, slurred speech, hallucinations, lethargy, vomiting, seizures, respiratory depression, coma, or sudden death. Examination may reveal chemical odors, cardiac arrhythmias, QT prolongation, hypoxia, metabolic acidosis, anemia, or muscle breakdown. Chronic use can lead to cardiomyopathy, nerve damage, and brain dysfunction.
Mechanism of Action
The effects of inhalants are diverse and not fully understood. Many act as central nervous system depressants, possibly through NMDA receptor inhibition or GABA enhancement. They can also displace oxygen in the lungs, leading to hypoxia. A dangerous phenomenon known as “sudden sniffing death” can occur when a surge of catecholamines triggers fatal arrhythmias in a sensitized heart.
Management
Treatment is supportive, focusing on airway protection, oxygenation, and management of complications such as arrhythmias or seizures.
Key Points
Source
Inhalant abuse involves breathing in vapors from volatile substances such as gasoline (hydrocarbons), aerosol sprays and computer dusters (halogenated hydrocarbons), nail polish remover (ketones), lighter fluid (butane), spray paints (toluene), nitrites (“poppers”), and nitrous oxide from whipped cream canisters.
Typical Presentation
Patients are often adolescents found with evidence of inhalant use, such as chemical-soaked materials. They may present with altered consciousness or unresponsiveness after exposure.
Clinical Features
Symptoms vary depending on the substance but may include skin flushing, irritation of the eyes and airways, poor coordination, slurred speech, hallucinations, lethargy, vomiting, seizures, respiratory depression, coma, or sudden death. Examination may reveal chemical odors, cardiac arrhythmias, QT prolongation, hypoxia, metabolic acidosis, anemia, or muscle breakdown. Chronic use can lead to cardiomyopathy, nerve damage, and brain dysfunction.
Mechanism of Action
The effects of inhalants are diverse and not fully understood. Many act as central nervous system depressants, possibly through NMDA receptor inhibition or GABA enhancement. They can also displace oxygen in the lungs, leading to hypoxia. A dangerous phenomenon known as “sudden sniffing death” can occur when a surge of catecholamines triggers fatal arrhythmias in a sensitized heart.
Management
Treatment is supportive, focusing on airway protection, oxygenation, and management of complications such as arrhythmias or seizures.
Key Points
- Inhalants are often among the first substances misused by adolescents due to accessibility and low cost.
- Sudden death may occur unexpectedly, particularly during stress or sudden fright.
- Methods of use include “sniffing” (direct inhalation), “huffing” (using a soaked cloth), and “bagging” (inhaling from a container or bag).
- Published on
Toxicology – Understanding Warfarin Drug Interactions
Overview
Warfarin is a commonly prescribed anticoagulant used to prevent blood clots such as thrombosis and thromboembolism. It is effective, affordable, and well studied. However, it requires regular monitoring through the INR and may not be suitable for patients with poor compliance or high fall risk.
Mechanism of Action
Warfarin works by blocking vitamin K epoxide reductase, an enzyme needed to activate vitamin K. This reduces the activity of vitamin K–dependent clotting factors II, VII, IX, and X, thereby decreasing blood coagulation.
How Drug Interactions Occur
Warfarin interacts with other medications through several mechanisms. Some antibiotics reduce vitamin K–producing gut flora, increasing bleeding risk. Certain drugs displace warfarin from plasma proteins, raising its active levels. Others either increase or decrease its metabolism, altering its effect. Additionally, drugs like aspirin and NSAIDs independently increase bleeding risk.
High-Risk Drug Interactions
Amiodarone
Can significantly enhance warfarin’s effect, with interactions that may persist even after discontinuation.
Aspirin
Low doses may be acceptable, but higher doses for pain or inflammation increase bleeding risk and should be avoided.
Azole Antifungals
These medications inhibit warfarin metabolism, leading to increased anticoagulant effects.
Ciprofloxacin
May interact unpredictably, occasionally increasing bleeding risk.
Macrolide Antibiotics
Azithromycin is preferred over erythromycin and clarithromycin due to a lower risk of interaction.
Metronidazole
Significantly increases INR; coadministration should be avoided or require dose reduction of warfarin.
NSAIDs
These drugs impair platelet function and substantially increase the risk of bleeding.
Omeprazole
May increase INR and prolong bleeding time.
Phenytoin
Can either increase or decrease warfarin’s anticoagulant effect, making monitoring essential.
Statins
May elevate INR, especially after dose changes, requiring closer monitoring.
Trimethoprim-Sulfamethoxazole (TMP/SMX)
This combination has highly unpredictable effects and should generally be avoided.
Key Points
Overview
Warfarin is a commonly prescribed anticoagulant used to prevent blood clots such as thrombosis and thromboembolism. It is effective, affordable, and well studied. However, it requires regular monitoring through the INR and may not be suitable for patients with poor compliance or high fall risk.
Mechanism of Action
Warfarin works by blocking vitamin K epoxide reductase, an enzyme needed to activate vitamin K. This reduces the activity of vitamin K–dependent clotting factors II, VII, IX, and X, thereby decreasing blood coagulation.
How Drug Interactions Occur
Warfarin interacts with other medications through several mechanisms. Some antibiotics reduce vitamin K–producing gut flora, increasing bleeding risk. Certain drugs displace warfarin from plasma proteins, raising its active levels. Others either increase or decrease its metabolism, altering its effect. Additionally, drugs like aspirin and NSAIDs independently increase bleeding risk.
High-Risk Drug Interactions
Amiodarone
Can significantly enhance warfarin’s effect, with interactions that may persist even after discontinuation.
Aspirin
Low doses may be acceptable, but higher doses for pain or inflammation increase bleeding risk and should be avoided.
Azole Antifungals
These medications inhibit warfarin metabolism, leading to increased anticoagulant effects.
Ciprofloxacin
May interact unpredictably, occasionally increasing bleeding risk.
Macrolide Antibiotics
Azithromycin is preferred over erythromycin and clarithromycin due to a lower risk of interaction.
Metronidazole
Significantly increases INR; coadministration should be avoided or require dose reduction of warfarin.
NSAIDs
These drugs impair platelet function and substantially increase the risk of bleeding.
Omeprazole
May increase INR and prolong bleeding time.
Phenytoin
Can either increase or decrease warfarin’s anticoagulant effect, making monitoring essential.
Statins
May elevate INR, especially after dose changes, requiring closer monitoring.
Trimethoprim-Sulfamethoxazole (TMP/SMX)
This combination has highly unpredictable effects and should generally be avoided.
Key Points
- Warfarin has interactions with hundreds of medications.
- Although many antibiotics interact with warfarin, penicillin is considered relatively safer.
- Published on
Toxicology – Common Rat Poisons and How They Work
Bromethalin
Bromethalin disrupts energy production by uncoupling oxidative phosphorylation within mitochondria, leading to cellular failure.
Strychnine
This toxin blocks glycine receptors in the central nervous system, resulting in severe, painful tonic–clonic seizures while the patient remains conscious.
Arsenic
Arsenic interferes with cellular energy production by inhibiting pyruvate dehydrogenase, ultimately reducing ATP generation.
Phosphides
Phosphide compounds release phosphine gas upon contact with moisture, a highly toxic substance that disrupts cellular respiration.
Thallium
Thallium interferes with potassium-dependent processes, impairing mitochondrial function and disrupting muscle and nerve activity.
Barium
Barium blocks potassium channels, leading to significant electrolyte disturbances and neuromuscular dysfunction.
Coumarin-Like Anticoagulants
These rodenticides act as vitamin K antagonists, impairing clotting factor synthesis and increasing bleeding risk.
Indanediones
A class of anticoagulant rodenticides (e.g., diphacinone, chlorophacinone, pindone) that interfere with coagulation pathways.
Tetramine
Tetramine is a potent, irreversible GABA antagonist that leads to severe, refractory seizures.
Phosphorus
Phosphorus is a highly toxic substance that causes direct cellular injury and organ damage.
Norbormide
Norbormide acts as a vasoconstrictor and calcium channel blocker, disrupting blood flow and cellular function.
Red Squill
Derived from a Mediterranean plant, red squill has cardiotoxic effects and has historically been used as a rodenticide.
ANTU (Alpha-Naphthylthiourea)
This compound causes pulmonary edema, particularly in rodents, leading to respiratory failure.
Bromethalin
Bromethalin disrupts energy production by uncoupling oxidative phosphorylation within mitochondria, leading to cellular failure.
Strychnine
This toxin blocks glycine receptors in the central nervous system, resulting in severe, painful tonic–clonic seizures while the patient remains conscious.
Arsenic
Arsenic interferes with cellular energy production by inhibiting pyruvate dehydrogenase, ultimately reducing ATP generation.
Phosphides
Phosphide compounds release phosphine gas upon contact with moisture, a highly toxic substance that disrupts cellular respiration.
Thallium
Thallium interferes with potassium-dependent processes, impairing mitochondrial function and disrupting muscle and nerve activity.
Barium
Barium blocks potassium channels, leading to significant electrolyte disturbances and neuromuscular dysfunction.
Coumarin-Like Anticoagulants
These rodenticides act as vitamin K antagonists, impairing clotting factor synthesis and increasing bleeding risk.
Indanediones
A class of anticoagulant rodenticides (e.g., diphacinone, chlorophacinone, pindone) that interfere with coagulation pathways.
Tetramine
Tetramine is a potent, irreversible GABA antagonist that leads to severe, refractory seizures.
Phosphorus
Phosphorus is a highly toxic substance that causes direct cellular injury and organ damage.
Norbormide
Norbormide acts as a vasoconstrictor and calcium channel blocker, disrupting blood flow and cellular function.
Red Squill
Derived from a Mediterranean plant, red squill has cardiotoxic effects and has historically been used as a rodenticide.
ANTU (Alpha-Naphthylthiourea)
This compound causes pulmonary edema, particularly in rodents, leading to respiratory failure.
- Published on
Toxicology – Marijuana (Cannabis)
Source
Marijuana is derived from the female Cannabis plant and can be used in various forms, including smoking, ingestion, or as a brewed preparation.
Typical Presentation
A common scenario involves recreational use in social settings, leading to feelings of relaxation, euphoria, altered perception, and impaired coordination. Users may describe changes in time perception and sensory experiences.
Clinical Features
Psychological effects include euphoria, calmness, altered perception, impaired attention, decreased concentration, and possible hallucinations. Physical findings may include increased heart rate, elevated blood pressure, dry mouth, rapid breathing, red eyes (conjunctival injection), and increased appetite. Coordination and motor function may also be impaired.
Mechanism of Action
The primary psychoactive component, delta-9-tetrahydrocannabinol (THC), is highly lipophilic and rapidly absorbed, with peak levels occurring shortly after inhalation. THC acts on cannabinoid receptors (CB1 in the central nervous system and CB2 in peripheral tissues), modulating neurotransmitter release. Due to its fat solubility, THC accumulates in adipose tissue and may remain detectable for extended periods, especially in frequent users.
Management
Treatment is supportive. Reassurance is often sufficient, and benzodiazepines may be used for significant anxiety or agitation.
Key Points
Source
Marijuana is derived from the female Cannabis plant and can be used in various forms, including smoking, ingestion, or as a brewed preparation.
Typical Presentation
A common scenario involves recreational use in social settings, leading to feelings of relaxation, euphoria, altered perception, and impaired coordination. Users may describe changes in time perception and sensory experiences.
Clinical Features
Psychological effects include euphoria, calmness, altered perception, impaired attention, decreased concentration, and possible hallucinations. Physical findings may include increased heart rate, elevated blood pressure, dry mouth, rapid breathing, red eyes (conjunctival injection), and increased appetite. Coordination and motor function may also be impaired.
Mechanism of Action
The primary psychoactive component, delta-9-tetrahydrocannabinol (THC), is highly lipophilic and rapidly absorbed, with peak levels occurring shortly after inhalation. THC acts on cannabinoid receptors (CB1 in the central nervous system and CB2 in peripheral tissues), modulating neurotransmitter release. Due to its fat solubility, THC accumulates in adipose tissue and may remain detectable for extended periods, especially in frequent users.
Management
Treatment is supportive. Reassurance is often sufficient, and benzodiazepines may be used for significant anxiety or agitation.
Key Points
- Cannabis can be consumed by smoking, ingestion, or brewing into beverages.
- Oral use has a delayed onset (typically 1–3 hours) and may lead to stronger or unpredictable effects.
- Marijuana may sometimes be contaminated with other substances such as PCP or stimulants.
- Substances marketed as “formaldehyde-treated” marijuana are often actually contaminated with PCP rather than formaldehyde itself.
- Published on
Toxicology – Nephrotoxins and Acute Kidney Injury
Overview
Acute kidney injury (AKI) can be categorized into three major types based on the underlying cause: prerenal, intrinsic, and postrenal. Identifying the category helps guide diagnosis and management.
Prerenal Causes
These result from decreased renal perfusion. Common examples include hypotension, dehydration, and narrowing of the renal arteries.
Intrinsic Causes
These involve direct damage to kidney structures. Examples include glomerulonephritis, acute tubular necrosis (ATN), and acute interstitial nephritis.
Postrenal Causes
These are due to obstruction of urine flow, such as kidney stones, tumors, benign prostatic hyperplasia (BPH), or other urinary tract blockages.
Toxic Acute Tubular Necrosis (ATN)
Chemical and Environmental Exposures
Pesticides, iodinated contrast agents, and organic solvents such as carbon tetrachloride and chloroform can directly damage renal tubules.
Pigment-Related Injury
Hemoglobin from hemolysis and myoglobin from rhabdomyolysis can accumulate in renal tubules, leading to kidney injury.
Toxic Alcohols
Substances like ethylene glycol and methanol can cause severe renal damage through toxic metabolites.
Heavy Metals
Metals such as mercury, arsenic, lead, chromium, gold, and cadmium are known nephrotoxins.
Paraproteinemia
Bence Jones proteins, often seen in multiple myeloma, can damage renal tubules and impair function.
Medications and Substances
Drugs such as aminoglycosides, acyclovir, cidofovir, indinavir, cisplatin, cyclosporine, tacrolimus, and NSAIDs are commonly implicated. Certain herbal toxins (e.g., aristolochic acid) and foods like star fruit have also been associated with nephrotoxicity.
Ischemic Acute Tubular Necrosis
This form of ATN results from reduced blood flow and oxygen delivery to the kidneys. Causes include shock, severe burns, trauma, sepsis, pancreatitis, liver cirrhosis, renal artery embolism, and disseminated intravascular coagulation. It may also occur with conditions such as hypercalcemia, tumor lysis syndrome (hyperuricemia), phosphate nephropathy, and exposure to medications like ACE inhibitors, ARBs, mannitol, and NSAIDs.
Overview
Acute kidney injury (AKI) can be categorized into three major types based on the underlying cause: prerenal, intrinsic, and postrenal. Identifying the category helps guide diagnosis and management.
Prerenal Causes
These result from decreased renal perfusion. Common examples include hypotension, dehydration, and narrowing of the renal arteries.
Intrinsic Causes
These involve direct damage to kidney structures. Examples include glomerulonephritis, acute tubular necrosis (ATN), and acute interstitial nephritis.
Postrenal Causes
These are due to obstruction of urine flow, such as kidney stones, tumors, benign prostatic hyperplasia (BPH), or other urinary tract blockages.
Toxic Acute Tubular Necrosis (ATN)
Chemical and Environmental Exposures
Pesticides, iodinated contrast agents, and organic solvents such as carbon tetrachloride and chloroform can directly damage renal tubules.
Pigment-Related Injury
Hemoglobin from hemolysis and myoglobin from rhabdomyolysis can accumulate in renal tubules, leading to kidney injury.
Toxic Alcohols
Substances like ethylene glycol and methanol can cause severe renal damage through toxic metabolites.
Heavy Metals
Metals such as mercury, arsenic, lead, chromium, gold, and cadmium are known nephrotoxins.
Paraproteinemia
Bence Jones proteins, often seen in multiple myeloma, can damage renal tubules and impair function.
Medications and Substances
Drugs such as aminoglycosides, acyclovir, cidofovir, indinavir, cisplatin, cyclosporine, tacrolimus, and NSAIDs are commonly implicated. Certain herbal toxins (e.g., aristolochic acid) and foods like star fruit have also been associated with nephrotoxicity.
Ischemic Acute Tubular Necrosis
This form of ATN results from reduced blood flow and oxygen delivery to the kidneys. Causes include shock, severe burns, trauma, sepsis, pancreatitis, liver cirrhosis, renal artery embolism, and disseminated intravascular coagulation. It may also occur with conditions such as hypercalcemia, tumor lysis syndrome (hyperuricemia), phosphate nephropathy, and exposure to medications like ACE inhibitors, ARBs, mannitol, and NSAIDs.
- Published on
Toxicology – Pancreatitis and Pancreatic Toxins
Overview
Pancreatitis is inflammation of the pancreas with multiple possible causes. While many cases are due to common conditions like gallstones and alcohol use, toxins, drugs, and metabolic abnormalities also play significant roles.
Common Causes
Gallstones
Gallstones are one of the leading causes of pancreatitis and, together with alcohol, account for the majority of cases.
Ethanol (Alcohol)
Alcohol is a major contributor to both acute and chronic pancreatitis due to its direct toxic effects on pancreatic cells.
Idiopathic
In some cases, no clear cause can be identified despite thorough evaluation.
Trauma
Blunt or penetrating injury to the abdomen can damage the pancreas and trigger inflammation.
Steroids and Hormones
Both corticosteroids and certain hormonal therapies have been associated with pancreatitis.
Infections
Viruses such as mumps, cytomegalovirus (CMV), and coxsackievirus can lead to pancreatic inflammation.
Malignancy
Pancreatic cancer may present with or contribute to pancreatitis and generally carries a poor prognosis.
Autoimmune Causes
Autoimmune pancreatitis is a form of chronic inflammation that often responds well to steroid therapy.
Scorpion Envenomation
Although uncommon, scorpion stings have been reported to trigger pancreatitis.
Metabolic Causes
Hypercalcemia
Elevated calcium levels, often due to hyperparathyroidism, can precipitate pancreatitis.
Hypertriglyceridemia
Very high triglyceride levels (typically >1,000 mg/dL) are a well-recognized cause.
Procedural Causes
Post-ERCP
Pancreatitis may occur after endoscopic retrograde cholangiopancreatography (ERCP), with a notable incidence in clinical practice.
Drug-Induced Pancreatitis
Common Drug Classes
Corticosteroids, antiretroviral (HIV) medications, chemotherapeutic agents, and thiazide diuretics are associated with pancreatic inflammation.
Specific Medications
Drugs known to cause pancreatitis include azathioprine, carbamazepine, cisplatin, didanosine, lamivudine, mercaptopurine, mesalamine, pentamidine, sulindac, tetracycline, valproic acid, and steroids.
Overview
Pancreatitis is inflammation of the pancreas with multiple possible causes. While many cases are due to common conditions like gallstones and alcohol use, toxins, drugs, and metabolic abnormalities also play significant roles.
Common Causes
Gallstones
Gallstones are one of the leading causes of pancreatitis and, together with alcohol, account for the majority of cases.
Ethanol (Alcohol)
Alcohol is a major contributor to both acute and chronic pancreatitis due to its direct toxic effects on pancreatic cells.
Idiopathic
In some cases, no clear cause can be identified despite thorough evaluation.
Trauma
Blunt or penetrating injury to the abdomen can damage the pancreas and trigger inflammation.
Steroids and Hormones
Both corticosteroids and certain hormonal therapies have been associated with pancreatitis.
Infections
Viruses such as mumps, cytomegalovirus (CMV), and coxsackievirus can lead to pancreatic inflammation.
Malignancy
Pancreatic cancer may present with or contribute to pancreatitis and generally carries a poor prognosis.
Autoimmune Causes
Autoimmune pancreatitis is a form of chronic inflammation that often responds well to steroid therapy.
Scorpion Envenomation
Although uncommon, scorpion stings have been reported to trigger pancreatitis.
Metabolic Causes
Hypercalcemia
Elevated calcium levels, often due to hyperparathyroidism, can precipitate pancreatitis.
Hypertriglyceridemia
Very high triglyceride levels (typically >1,000 mg/dL) are a well-recognized cause.
Procedural Causes
Post-ERCP
Pancreatitis may occur after endoscopic retrograde cholangiopancreatography (ERCP), with a notable incidence in clinical practice.
Drug-Induced Pancreatitis
Common Drug Classes
Corticosteroids, antiretroviral (HIV) medications, chemotherapeutic agents, and thiazide diuretics are associated with pancreatic inflammation.
Specific Medications
Drugs known to cause pancreatitis include azathioprine, carbamazepine, cisplatin, didanosine, lamivudine, mercaptopurine, mesalamine, pentamidine, sulindac, tetracycline, valproic acid, and steroids.
- Published on
Toxicology – Ototoxic Drugs
Overview
Ototoxic medications can damage the inner ear, affecting either the cochlea (leading to sensorineural hearing loss), the vestibular system (causing balance disturbances), or both.
Clinical Features
Patients may present with hearing impairment, ringing in the ears (tinnitus), or problems with balance and coordination (disequilibrium). Symptoms can vary depending on whether cochlear or vestibular structures are involved.
Common Drug Classes
Medications known to cause ototoxicity include aminoglycoside antibiotics, loop diuretics, nonsteroidal anti-inflammatory drugs (NSAIDs), opioids, platinum-based chemotherapeutic agents, quinidine, quinine, salicylates, tetracyclines, and valproic acid.
Management
The primary approach is prompt discontinuation of the offending agent when possible. Patients should be referred for evaluation by an ear, nose, and throat (ENT) specialist and audiology testing to assess the extent of hearing or balance dysfunction.
Overview
Ototoxic medications can damage the inner ear, affecting either the cochlea (leading to sensorineural hearing loss), the vestibular system (causing balance disturbances), or both.
Clinical Features
Patients may present with hearing impairment, ringing in the ears (tinnitus), or problems with balance and coordination (disequilibrium). Symptoms can vary depending on whether cochlear or vestibular structures are involved.
Common Drug Classes
Medications known to cause ototoxicity include aminoglycoside antibiotics, loop diuretics, nonsteroidal anti-inflammatory drugs (NSAIDs), opioids, platinum-based chemotherapeutic agents, quinidine, quinine, salicylates, tetracyclines, and valproic acid.
Management
The primary approach is prompt discontinuation of the offending agent when possible. Patients should be referred for evaluation by an ear, nose, and throat (ENT) specialist and audiology testing to assess the extent of hearing or balance dysfunction.
