AdultPediatricDosage Forms & Strengths capsule 267mg (Esbreit, generic) tablet 267 mg (Esbreit, generic) 801 mg (Esbreit, generic) Idiopathic Pulmonary Fibrosis Initial dose titration Take with food Days 1-7: 267 mg PO TID (801 mg/day) Days 8-14: 534 mg PO TID (1602 mg/day) Day 15 and thereafter (maintenance): 801 mg PO TID; not to exceed 2403 mg/day Dosage Modifications If patients experience significant adverse reactions (ie, gastrointestinal, photosensitivity reaction, rash, or severe cutaneous adverse reactions [SCAR]), consider temporary dosage reductions or therapy interruptions of pirfenidone to allow for resolution of symptoms; discontinue if symptoms persist despite these interventions CYP1A2 inhibitors Strong inhibitors (eg, fluvoxamine, enoxacin): Reduce maintenance dose to 267 mg (1 capsule) TID Moderate inhibitors (eg, ciprofloxacin 750 mg BID): Reduce maintenance dose to 534 mg (2 capsules) TID Elevated liver enzymes AST/ALT >3 to ≤5 x ULN (without symptoms): Discontinue confounding medications, exclude other causes, repeat liver function tests as needed; the full daily dosage may be maintained, if clinically appropriate, or reduced or interrupted (eg, until liver chemistry tests are within normal limits), with subsequent retitration to the full dosage as tolerated AST/ALT >5 x ULN or >3 times ULN with signs/symptoms of severe liver damage: Permanently discontinue; do not rechallenge Hepatic impairment Mild-to-moderate (Child Pugh A or B): Use caution; monitor and consider dosage modification or discontinuation as needed Severe (Child Pugh C): Not recommended (not studied) Renal impairment Mild, moderate, or severe: Use caution; monitor and consider dosage modification or discontinuation as needed ESRD requiring dialysis: Not recommended (not studied) Dosing Considerations Conduct liver function tests before initiating therapy (also see Dosage Modifications and Cautions)Safety and efficacy not establishedInteraction CheckerEnter a drug name and pirfenidoneNo Results No Interactions Found Interactions FoundContraindicatedSerious - Use AlternativeSignificant - Monitor CloselyMinorAll Interactions Sort By: SeverityName Contraindicated (4)carbamazepinecarbamazepine will decrease the level or effect of pirfenidone by affecting hepatic enzyme CYP1A2 metabolism. Contraindicated. Use of strong CYP1A2 inducers should be discontinued before initiating pirfenidone and avoided during treatmentphenobarbitalphenobarbital will decrease the level or effect of pirfenidone by affecting hepatic enzyme CYP1A2 metabolism. Contraindicated. Use of strong CYP1A2 inducers should be discontinued before initiating pirfenidone and avoided during treatmentprimidoneprimidone will decrease the level or effect of pirfenidone by affecting hepatic enzyme CYP1A2 metabolism. Contraindicated. Use of strong CYP1A2 inducers should be discontinued before initiating pirfenidone and avoided during treatmentrifampinrifampin will decrease the level or effect of pirfenidone by affecting hepatic enzyme CYP1A2 metabolism. Contraindicated. Use of strong CYP1A2 inducers should be discontinued before initiating pirfenidone and avoided during treatmentSerious - Use Alternative (21)abametapirabametapir will increase the level or effect of pirfenidone by affecting hepatic enzyme CYP1A2 metabolism. Avoid or Use Alternate Drug. For 2 weeks after abametapir application, avoid taking drugs that are CYP1A2 substrates. If not feasible, avoid use of abametapir.aminolevulinic acid oralaminolevulinic acid oral, pirfenidone. Either increases toxicity of the other by pharmacodynamic synergism. Avoid or Use Alternate Drug. Avoid administering other phototoxic drugs with aminolevulinic acid oral for 24 hr during perioperative period.aminolevulinic acid topicalpirfenidone, aminolevulinic acid topical. Either increases toxicity of the other by pharmacodynamic synergism. Avoid or Use Alternate Drug. Each drug may increase the photosensitizing effect of the other.cigarette smokingcigarette smoking will increase the level or effect of pirfenidone by affecting hepatic enzyme CYP1A2 metabolism. Avoid or Use Alternate Drug. Avoid; coadministration of pirfenidone and moderate CYP1A2 inhibitors result in moderately increased exposure to pirfenidone; if unable to avoid, decrease dose of moderate CYP1A2 inhibitorcimetidinecimetidine will increase the level or effect of pirfenidone by affecting hepatic enzyme CYP1A2 metabolism. Avoid or Use Alternate Drug. Avoid; coadministration of pirfenidone and moderate CYP1A2 inhibitors result in moderately increased exposure to pirfenidone; if unable to avoid, decrease dose of moderate CYP1A2 inhibitorciprofloxacinciprofloxacin will increase the level or effect of pirfenidone by affecting hepatic enzyme CYP1A2 metabolism. Avoid or Use Alternate Drug. Use of strong CYP1A2 inhibitors should be discontinued before initiating pirfenidone and avoided during treatment; if strong CYP1A2 inhibitors are the only drug of choice, dosage reductions are recommendeddiclofenacdiclofenac will increase the level or effect of pirfenidone by affecting hepatic enzyme CYP1A2 metabolism. Avoid or Use Alternate Drug. Avoid; coadministration of pirfenidone and moderate CYP1A2 inhibitors result in moderately increased exposure to pirfenidone; if unable to avoid, decrease dose of moderate CYP1A2 inhibitorfluoxetinefluoxetine will increase the level or effect of pirfenidone by affecting hepatic enzyme CYP1A2 metabolism. Avoid or Use Alternate Drug. Avoid; coadministration of pirfenidone and moderate CYP1A2 inhibitors result in moderately increased exposure to pirfenidone; if unable to avoid, decrease dose of moderate CYP1A2 inhibitorfluvoxaminefluvoxamine will increase the level or effect of pirfenidone by affecting hepatic enzyme CYP1A2 metabolism. Avoid or Use Alternate Drug. Use of strong CYP1A2 inhibitors should be discontinued before initiating treatment and avoided during treatment; if strong CYP1A2 inhibitor is only option, dosage reduction recommendedgemfibrozilgemfibrozil will increase the level or effect of pirfenidone by affecting hepatic enzyme CYP1A2 metabolism. Avoid or Use Alternate Drug. Avoid; coadministration of pirfenidone and moderate CYP1A2 inhibitors result in moderately increased exposure to pirfenidone; if unable to avoid, decrease dose of moderate CYP1A2 inhibitorgivosirangivosiran will increase the level or effect of pirfenidone by affecting hepatic enzyme CYP1A2 metabolism. Avoid or Use Alternate Drug. Avoid coadministration of sensitive CYP1A2 substrates with givosiran. If unavoidable, decrease the CYP1A2 substrate dosage in accordance with approved product labeling.leniolisibleniolisib will increase the level or effect of pirfenidone by affecting hepatic enzyme CYP1A2 metabolism. Avoid or Use Alternate Drug. If unable to avoid coadministration, decrease pirfenidone dosemethoxsalenmethoxsalen will increase the level or effect of pirfenidone by affecting hepatic enzyme CYP1A2 metabolism. Avoid or Use Alternate Drug. Use of strong CYP1A2 inhibitors should be discontinued before initiating pirfenidone and avoided during treatment; if strong CYP1A2 inhibitors are the only drug of choice, dosage reductions are recommendedmethyl aminolevulinatepirfenidone, methyl aminolevulinate. Either increases toxicity of the other by pharmacodynamic synergism. Avoid or Use Alternate Drug. Each drug may increase the photosensitizing effect of the other.mexiletinemexiletine will increase the level or effect of pirfenidone by affecting hepatic enzyme CYP1A2 metabolism. Avoid or Use Alternate Drug. Use of strong CYP1A2 inhibitors should be discontinued before initiating pirfenidone and avoided during treatment; if strong CYP1A2 inhibitors are the only drug of choice, dosage reductions are recommendednifedipinenifedipine will increase the level or effect of pirfenidone by affecting hepatic enzyme CYP1A2 metabolism. Avoid or Use Alternate Drug. Avoid; coadministration of pirfenidone and moderate CYP1A2 inhibitors result in moderately increased exposure to pirfenidone; if unable to avoid, decrease dose of moderate CYP1A2 inhibitorofloxacinofloxacin will increase the level or effect of pirfenidone by affecting hepatic enzyme CYP1A2 metabolism. Avoid or Use Alternate Drug. Use of strong CYP1A2 inhibitors should be discontinued before initiating pirfenidone and avoided during treatment; if strong CYP1A2 inhibitors are the only drug of choice, dosage reductions are recommendedprimaquineprimaquine will increase the level or effect of pirfenidone by affecting hepatic enzyme CYP1A2 metabolism. Avoid or Use Alternate Drug. Use of strong CYP1A2 inhibitors should be discontinued before initiating pirfenidone and avoided during treatment; if strong CYP1A2 inhibitors are the only drug of choice, dosage reductions are recommendedpropofolpropofol will increase the level or effect of pirfenidone by affecting hepatic enzyme CYP1A2 metabolism. Avoid or Use Alternate Drug. Avoid; coadministration of pirfenidone and moderate CYP1A2 inhibitors result in moderately increased exposure to pirfenidone; if unable to avoid, decrease dose of moderate CYP1A2 inhibitortranylcyprominetranylcypromine will increase the level or effect of pirfenidone by affecting hepatic enzyme CYP1A2 metabolism. Avoid or Use Alternate Drug. Avoid; coadministration of pirfenidone and moderate CYP1A2 inhibitors result in moderately increased exposure to pirfenidone; if unable to avoid, decrease dose of moderate CYP1A2 inhibitorzileutonzileuton will increase the level or effect of pirfenidone by affecting hepatic enzyme CYP1A2 metabolism. Avoid or Use Alternate Drug. Use of strong CYP1A2 inhibitors should be discontinued before initiating pirfenidone and avoided during treatment; if strong CYP1A2 inhibitors are the only drug of choice, dosage reductions are recommendedMonitor Closely (11)cannabidiolcannabidiol, pirfenidone. affecting hepatic enzyme CYP1A2 metabolism. Modify Therapy/Monitor Closely. Owing to the potential for both CYP1A2 induction and inhibition with the coadministration of CYP1A2 substrates and cannabidiol, consider reducing dosage adjustment of CYP1A2 substrates as clinically appropriate.epcoritamabepcoritamab, pirfenidone. affecting hepatic enzyme CYP1A2 metabolism. Use Caution/Monitor. Epcoritamab causes release of cytokines that may suppress activity of CYP enzymes, resulting in increased exposure of CYP substrates. For certain CYP substrates, minimal changes in their concentration may lead to serious adverse reactions. If needed, modify therapy as recommended in the substrate's prescribing information. .fexinidazolefexinidazole will increase the level or effect of pirfenidone by affecting hepatic enzyme CYP1A2 metabolism. Use Caution/Monitor.glofitamabglofitamab, pirfenidone. affecting hepatic enzyme CYP1A2 metabolism. Use Caution/Monitor. Glofitamab causes release of cytokines that may suppress activity of CYP enzymes, resulting in increased exposure of CYP substrates. For certain CYP substrates, minimal changes in their concentration may lead to serious adverse reactions. If needed, modify therapy as recommended in the substrate's prescribing information. .lonapegsomatropinlonapegsomatropin will decrease the level or effect of pirfenidone by affecting hepatic enzyme CYP1A2 metabolism. Use Caution/Monitor. Limited published data indicate that growth hormone treatment increases cytochrome P450 (CYP450)-mediated antipyrine clearance. Caution with sensitive CYP substratesritlecitinibritlecitinib will increase the level or effect of pirfenidone by affecting hepatic enzyme CYP1A2 metabolism. Modify Therapy/Monitor Closely. Ritlecitinib inhibits CYP1A2 substrates; coadministration increases AUC and peak plasma concentration sensitive substrates, which may increase risk of adverse reactions. Additional monitoring and dosage adjustment may be needed in accordance with product labeling of CYP1A2 substrates. rucaparibrucaparib will increase the level or effect of pirfenidone by affecting hepatic enzyme CYP1A2 metabolism. Modify Therapy/Monitor Closely. Adjust dosage of CYP1A2 substrates, if clinically indicated.somapacitansomapacitan will decrease the level or effect of pirfenidone by affecting hepatic enzyme CYP1A2 metabolism. Use Caution/Monitor. Limited published data indicate that growth hormone treatment increases cytochrome P450 (CYP450)-mediated antipyrine clearance. Caution with sensitive CYP substratessomatrogonsomatrogon will decrease the level or effect of pirfenidone by affecting hepatic enzyme CYP1A2 metabolism. Use Caution/Monitor. Limited published data indicate that growth hormone treatment increases cytochrome P450 (CYP450)-mediated antipyrine clearance. Caution with sensitive CYP substratessomatropinsomatropin will decrease the level or effect of pirfenidone by affecting hepatic enzyme CYP1A2 metabolism. Use Caution/Monitor. Limited published data indicate that growth hormone treatment increases cytochrome P450 (CYP450)-mediated antipyrine clearance. Caution with sensitive CYP substratesstiripentolstiripentol, pirfenidone. affecting hepatic enzyme CYP1A2 metabolism. Modify Therapy/Monitor Closely. Stiripentol is a CYP1A2 inhibitor and inducer. Monitor CYP1A2 substrates coadministered with stiripentol for increased or decreased effects. CYP1A2 substrates may require dosage adjustment.Minor (0)abametapirSerious - Use Alternative (1)abametapir will increase the level or effect of pirfenidone by affecting hepatic enzyme CYP1A2 metabolism. Avoid or Use Alternate Drug. For 2 weeks after abametapir application, avoid taking drugs that are CYP1A2 substrates. If not feasible, avoid use of abametapir.aminolevulinic acid oralSerious - Use Alternative (1)aminolevulinic acid oral, pirfenidone. Either increases toxicity of the other by pharmacodynamic synergism. Avoid or Use Alternate Drug. Avoid administering other phototoxic drugs with aminolevulinic acid oral for 24 hr during perioperative period.aminolevulinic acid topicalSerious - Use Alternative (1)pirfenidone, aminolevulinic acid topical. Either increases toxicity of the other by pharmacodynamic synergism. Avoid or Use Alternate Drug. Each drug may increase the photosensitizing effect of the other.cannabidiolMonitor Closely (1)cannabidiol, pirfenidone. affecting hepatic enzyme CYP1A2 metabolism. Modify Therapy/Monitor Closely. Owing to the potential for both CYP1A2 induction and inhibition with the coadministration of CYP1A2 substrates and cannabidiol, consider reducing dosage adjustment of CYP1A2 substrates as clinically appropriate.carbamazepineContraindicated (1)carbamazepine will decrease the level or effect of pirfenidone by affecting hepatic enzyme CYP1A2 metabolism. Contraindicated. Use of strong CYP1A2 inducers should be discontinued before initiating pirfenidone and avoided during treatmentcigarette smokingSerious - Use Alternative (1)cigarette smoking will increase the level or effect of pirfenidone by affecting hepatic enzyme CYP1A2 metabolism. Avoid or Use Alternate Drug. Avoid; coadministration of pirfenidone and moderate CYP1A2 inhibitors result in moderately increased exposure to pirfenidone; if unable to avoid, decrease dose of moderate CYP1A2 inhibitorcimetidineSerious - Use Alternative (1)cimetidine will increase the level or effect of pirfenidone by affecting hepatic enzyme CYP1A2 metabolism. Avoid or Use Alternate Drug. Avoid; coadministration of pirfenidone and moderate CYP1A2 inhibitors result in moderately increased exposure to pirfenidone; if unable to avoid, decrease dose of moderate CYP1A2 inhibitorciprofloxacinSerious - Use Alternative (1)ciprofloxacin will increase the level or effect of pirfenidone by affecting hepatic enzyme CYP1A2 metabolism. Avoid or Use Alternate Drug. Use of strong CYP1A2 inhibitors should be discontinued before initiating pirfenidone and avoided during treatment; if strong CYP1A2 inhibitors are the only drug of