nelfinavir, Viracept (cont.)

Pharmacy Author:
Medical and Pharmacy Editor:

DRUG INTERACTIONS: Nelfinavir interacts with many drugs because it reduces the ability of liver enzymes to break down certain drugs. Some of the important interactions are discussed below. Viewers should consult their health care professional before combining any drugs with nelfinavir.

Nelfinavir should not be used together with alfuzosin (Uroxatral), lovastatin (Mevacor), simvastatin (Zocor), pimozide (Orap), sildenafil (Revatio), amiodarone (Cordarone), quinidine (Quinaglute, Cardioquin), ergot derivatives (for example, Ergostat), triazolam (Halcion), and midazolam (Versed), because serious adverse effects could occur due to increased levels of these drug in the body.

Nelfinavir also may increase blood levels of vardenafil (Levitra, Staxyn), tadalafil (Cialis, Adcirca), and sildenafil (Viagra), leading to increased side effects. Dosage adjustments are recommended.

Nelfinavir also increases the concentrations in blood of rifabutin (Mycobutin). Therefore, the doses of rifabutin should be reduced.

Rifampin and St. John's wort decrease the concentration of nelfinavir in the body and may reduce the effectiveness of nelfinavir.

Nelfinavir may decrease the effectiveness of oral contraceptives.

PREGNANCY: Nelfinavir has not been adequately evaluated in pregnant women.

NURSING MOTHERS: It is not known whether nelfinavir is secreted in breast milk. Nevertheless, HIV-infected mothers should not breastfeed because of the potential risk of transmitting HIV to an infant that is not infected.

Medically reviewed by Eni Williams, PharmD

Reference: FDA Prescribing Information


Medically Reviewed by a Doctor on 7/10/2015


Report Problems to the Food and Drug Administration

You are encouraged to report negative side effects of prescription drugs to the FDA. Visit the FDA MedWatch website or call 1-800-FDA-1088.

Pill Finder Tool

Need help identifying pills and medications?
Use the pill identifier tool on RxList.


Back to Medications Index