1. Chemotherapy drugs Examples include doxorubicin, cisplatin, methotrexate, cyclophosphamide, 5-fluorouracil and others. Chemotherapy is intentionally cytotoxic, meaning it damages or kills rapidly dividing cells. This can affect bone marrow, gastrointestinal tissues, hair follicles and other healthy tissues. Some agents can also cause kidney, heart, liver, nerve or bladder injury, depending on the drug.
2. Cisplatin One of the classic highly toxic antineoplastic drugs. Major concerns include kidney toxicity, peripheral neuropathy, hearing damage and severe nausea/vomiting. Cisplatin toxicity is significant enough that specific drugs are used to reduce or treat certain toxic effects.
3. Doxorubicin A powerful anthracycline chemotherapy drug. Its most important distinctive toxicity is dose-dependent cardiac injury, which can lead to cardiomyopathy and heart failure. The FDA's cardiotoxicity research specifically identifies drugs with serious cardiac toxicity, and NCI lists dexrazoxane as a treatment for doxorubicin toxicity.
4. Methotrexate At high doses or in susceptible patients, methotrexate can cause bone-marrow suppression, mucosal injury, liver toxicity and kidney injury, with severe toxicity potentially becoming life-threatening. NCI identifies glucarpidase specifically for severe methotrexate toxicity.
5. Amphotericin B A powerful antifungal sometimes nicknamed "ampho-terrible" because of its toxicity profile. Important adverse effects include kidney injury, electrolyte disturbances, anemia and infusion-related reactions. The FDA's liver-toxicity database also identifies amphotericin B among drugs associated with drug-induced liver injury.
6. Amiodarone An effective antiarrhythmic with an unusually broad toxicity profile because it accumulates in tissues. Important toxicities include lung injury, liver injury, thyroid abnormalities, neurologic effects and ocular effects. The FDA's DILI dataset classifies amiodarone as associated with drug-induced liver injury.
7. Colchicine Therapeutic and toxic doses are relatively close. Significant overdose or accumulation can cause severe gastrointestinal toxicity, bone-marrow suppression, neuromuscular injury and potentially multiorgan failure. Toxicity becomes particularly concerning with impaired kidney function or interacting medications.
8. Digoxin has a narrow therapeutic index, meaning the difference between an effective concentration and a toxic concentration can be relatively small. Toxicity produces dangerous cardiac arrhythmias, gastrointestinal symptoms and neurological disturbances and can become life-threatening in overdose.
9. Warfarin Its major toxicity is potentially severe bleeding, particularly when dosing, diet, interacting medications or monitoring are not well controlled. Unlike many drugs on this list, its toxicity is primarily related to excessive anticoagulation rather than direct cellular destruction.
10. Phenobarbital A potent barbiturate with significant central nervous system toxicity. Excessive exposure causes profound sedation, respiratory depression, coma and cardiovascular complications. The FDA DILI database also identifies phenobarbital as associated with drug-induced liver injury.
Notes: Within chemotherapy, Cisplatin is particularly nephrotoxic and neurotoxic, doxorubicin is particularly cardiotoxic, methotrexate can produce severe systemic toxicity at high exposure, and some agents have substantial pulmonary, hepatic or bladder toxicity.
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