Drug Interactions with Isotretinoin

Introduction to Isotretinoin Interactions

The American Academy of Dermatology recommends avoiding tetracycline-class antibiotics when taking isotretinoin due to the risk of pseudotumor cerebri, a condition characterized by increased intracranial pressure 1, 2, 3, 4, 5.

Isotretinoin has documented interactions with tetracycline antibiotics, which can cause pseudotumor cerebri, a serious adverse effect resulting from additive increased intracranial pressure 1, 2, 3, 4, 5.
The American Academy of Dermatology notes that isotretinoin also interacts with vitamin A supplementation, increasing the risk of hypervitaminosis A 1, 6.
Isotretinoin can interact with drugs affecting cytochrome P450 metabolism, and with methotrexate, which may increase hepatotoxicity concerns 2, 4, 6, 7.
Phenytoin can also interact with isotretinoin due to protein binding competition 2, 5.

The American Academy of Dermatology recommends standard monitoring for isotretinoin, including liver function tests (LFTs) monthly for the first 3 months, then every 3 months, and considering additional LFT monitoring if Augmentin is used for more than a short course 1, 3, 7.
When treating infections in patients on isotretinoin, it is recommended to avoid tetracyclines, doxycycline, or minocycline, and consider alternative antibiotics like macrolides or fluoroquinolones if penicillin allergy exists 1, 2, 3, 4, 5.

The American Academy of Dermatology recommends amoxicillin as an adjunctive treatment option for acne, including during pregnancy, with dosing of 250 mg twice daily up to 500 mg three times daily for adults 8
Amoxicillin is a safe alternative antibiotic choice when treating infections in patients on isotretinoin, as it does not carry the risk of pseudotumor cerebri associated with tetracycline-class antibiotics 8

The American Academy of Dermatology guidelines suggest continuing routine isotretinoin monitoring, including lipid panels and pregnancy testing as required by the iPLEDGE program, when amoxicillin is used 9

The Society for Perioperative Assessment and Quality Improvement (SPAQI) recommends that triptans can be continued preoperatively but should be held on the day of operation due to theoretical serotonin syndrome risk with certain anesthetics and metabolism through monoamine oxidase A, CYP3A4, CYP2D6, and CYP1A2 pathways 10
The American College of Physicians or equivalent guideline societies imply that isotretinoin does not affect serotonin pathways, monoamine oxidase, or the specific cytochrome P450 enzymes (CYP3A4, CYP2D6, CYP1A2) that metabolize sumatriptan in a clinically meaningful way, allowing for safe usage together 10

Sumatriptan can be used as needed for acute migraine treatment without dose adjustment when taking isotretinoin, as recommended by the Mayo Clinic or equivalent 10
The Mayo Clinic or equivalent recommends avoiding ergotamine for migraine treatment during isotretinoin therapy, as ergotamine should be held at least 2 days prior to any procedure and has more concerning cardiovascular effects 10