DIFICID®

(fidaxomicin) tablets, for oral use

Coverage

Pharmacy locator

Network pharmacies can help support your patients prescribed DIFICID.

Patient support features may include:

  • Information and assistance regarding access to therapy (including benefits investigation and reimbursement requirements)
  • Product availability
  • Next-day delivery of medications (after any prior authorization, if required, is approved)
  • Disease-related educational materials for patients

DIFICID is available at pharmacies in and out of the network. Check with your pharmacy to learn what features they offer to patients. Merck does not support the use of any particular pharmacy, and one is not preferred over the others. Merck does not make any warranty as to the features and support offered by any particular pharmacy.

If you are interested in becoming part of the speciality pharmacy network for DIFICID, please contact a dedicated representative at 1-800-642-6915 to learn how to get more information on eligibility requirements.

Indication

DIFICID is a macrolide antibacterial drug indicated in adults (≥18 years of age) for treatment of Clostridium difficile–associated diarrhea (CDAD). 

To reduce the development of drug-resistant bacteria and maintain the effectiveness of DIFICID and other antibacterial drugs, DIFICID should be used only to treat infections that are proven or strongly suspected to be caused by C difficile.

Selected Safety Information

  • DIFICID is contraindicated in patients with hypersensitivity to fidaxomicin.
  • DIFICID should not be used for systemic infections.
  • Acute hypersensitivity reactions, including dyspnea, rash pruritus, and angioedema of the mouth, throat, and face have been reported with fidaxomicin. If a severe hypersensitivity reaction occurs, DIFICID should be discontinued and appropriate therapy should be instituted.
  • Only use DIFICID for infection proven or strongly suspected to be caused by C difficile. Prescribing DIFICID in the absence of a proven or strongly suspected C difficile infection is unlikely to provide benefit to the patient and increases the risk of development of drug-resistant bacteria.
  • The most common adverse reactions reported in clinical trials are nausea (11%), vomiting (7%), abdominal pain (6%), gastrointestinal hemorrhage (4%), anemia (2%), and neutropenia (2%).
  • Among patients receiving DIFICID, 33 (5.9%) withdrew from trials as a result of adverse reactions. Vomiting was the primary adverse reaction leading to discontinuation of dosing (incidence of 0.5% for both DIFICID and vancomycin patients).
  • The safety and effectiveness of DIFICID in patients <18 years of age have not been established.
  • The recommended dose of DIFICID is one 200 mg tablet orally twice daily for 10 days, with or without food.
  • No dose adjustment is recommended for patients ≥65 years of age.
  • No dose adjustment is recommended for patients with renal impairment.
  • No dosage adjustments are recommended when co-administering fidaxomicin with substrates of P-gp or CYP enzymes.
  • The impact of hepatic impairment on the pharmacokinetics of fidaxomicin has not been evaluated; however, because fidaxomicin and its active metabolite (OP-1118) do not appear to undergo significant hepatic metabolism, elimination of fidaxomicin and OP-1118 is not expected to be significantly affected by hepatic impairment.
Before prescribing DIFICID® (fidaxomicin), please read the Prescribing Information.
AINF-1245964-000007/18