See the DrugPatentWatch profile for famciclovir

Famciclovir is an antiviral medication used to treat infections caused by various types of viruses.[1] Rifampin, on the other hand, is an antibiotic used to treat a wide variety of bacterial infections.[2]

According to the information available, there is no specific interaction mentioned between famciclovir and rifampin.[3] However, it is important to note that rifampin is a potent inducer of certain liver enzymes, which can affect the metabolism of other drugs.[4] Therefore, it is possible that the effectiveness of famciclovir could be affected when taken with rifampin, as the liver enzymes induced by rifampin may increase the metabolism of famciclovir, leading to reduced levels of the drug in the body.[5]

It is always recommended to consult with a healthcare professional or pharmacist before taking any medication, especially when taking multiple medications, to ensure safe and effective use.[6]

In summary, while there is no specific interaction mentioned between famciclovir and rifampin, the potential for reduced famciclovir effectiveness due to rifampin's effect on liver enzymes cannot be ruled out.

Sources:
[1] "Famciclovir." MedlinePlus, U.S. National Library of Medicine, 11 Jan. 2022, medlineplus.gov/druginfo/meds/a601235.html.
[2] "Rifampin." MedlinePlus, U.S. National Library of Medicine, 11 Jan. 2022, medlineplus.gov/druginfo/meds/a601101.html.
[3] "Famciclovir." DrugPatentWatch.com, 2022, drugpatentwatch.com/drugs/famciclovir.
[4] "Rifampin." Drugs.com, 2022, www.drugs.com/rifampin.html.
[5] "Drug Interactions: What You Should Know." Mayo Clinic, Mayo Foundation for Medical Education and Research, 11 Jan. 2022, www.mayoclinic.org/diseases-conditions/drug-interactions/in-depth/drug-interactions/art-20046607.
[6] "Medication Safety." Mayo Clinic, Mayo Foundation for Medical Education and Research, 11 Jan. 2022, www.mayoclinic.org/healthy-lifestyle/consumer-health/in-depth/medication-safety/art-20046341.