Hepatitis tóxica por amlodipino

Managing Multiple Myeloma in the Face of Drug-Induced Adverse Drug Reaction

Drug-induced liver injury has been reported to cause up to 10% of adverse drug reactions in the United States. Risk factors for druginduced liver injury include female gender, older age, interacting medications and drugs that are metabolized by the liver. This case report describes a patient who was newly initiated on tizanidine, an alpha2 adrenergic agonist used for muscle spasm and musculoskeletal pain, and bortezomib, a proteasome inhibitor used for multiple myeloma. Both medications are metabolized by cytochrome P450 isoenzyme 1A2. The medications were suspected of causing acute hepatitis based on the timing of their initiation and evidence to suggest that they can cause acute hepatitis. The Naranjo adverse drug reaction scale was scored as possible. In addition, the drugs' blood levels may have been increased by acyclovir and hydralazine, both inhibitors of cytochrome P450 isoenzyme 1A2. A dilemma for the team was how to best manage bortezomib. It is part of first line treatment for multiple myeloma when combined with lenalidomide and dexamethasone. Other proteasome inhibitors are available for multiple myeloma treatment. When starting chemotherapy, it is important to be aware of medications that cause a rise in liver enzymes, potential drug interactions, and how best to manage the clinical consequences.

A possible increase in liver enzymes due to amlodipine: A case report

Amlodipine is a commonly prescribed antihypertensive drug, well tolerated and has rarely been attributed as a cause for elevated liver enzymes. Here, we present a 47-year-old male patient known to be hypertensive and admitted to our rehabilitation facility after an acute stroke. During his stay, amlodipine was started in addition to other antihypertensive medications to control his blood pressure. His liver transaminases after 4 days (notably alanine aminotransferase) were found to be markedly elevated. After reviewing the medications and investigating probable causes, amlodipine was suspended. After 5 days of suspending amlodipine, the transaminases started to trend downward. The Naranjo Adverse Drug Reaction Probability Scale and the Roussel Uclaf Causality Assessment Method were performed to assess causality in this suspected idiosyncratic drug-induced liver injury case. Both the scores denoted a probable amlodipine-induced liver injury. Previous case reports related to amlodipine-induced liver injury are mentioned and presented in the table below. In conclusion, amlodipine, though not well known to be hepatotoxic, can induce liver enzyme elevations in an idiosyncratic manner.