This information is generalized and not intended as specific medical advice. Consult your healthcare professional before taking or discontinuing any drug or commencing any course of treatment.
Moderate. These medicines may cause some risk when taken together. Contact your healthcare professional (e.g. doctor or pharmacist) for more information.
How the interaction occurs:
Your protease inhibitor may slow down how quickly your liver processes sildenafil.
What might happen:
Your blood levels of sildenafil may increase and cause harmful effects.
What you should do about this interaction:
Let your healthcare professional (e.g. doctor or pharmacist) know that you are taking these medicines together. If you are taking sildenafil for pulmonary arterial hypertension (PAH), contact your doctor right away. Contact your doctor if you experience a painful or prolonged erection, fainting or dizziness, or changes in vision. The dose of your sildenafil may need adjusting.Your healthcare professionals (e.g. doctor or pharmacist) may already be aware of this interaction and may be monitoring you for it. Do not start, stop, or change the dosage of any medicine before checking with them first.
1.Viagra (sildenafil) US prescribing information. Pfizer Inc. January, 2011.
2.Reyataz (atazanavir sulfate) US prescribing information. Bristol-Myers Squibb Company March, 2012.
3.Prezista (darunavir) US prescribing information. Tibotec Inc. June, 2012.
4.Lexiva (fosamprenavir calcium) US prescribing information. GlaxoSmithKline April, 2012.
5.Crixivan (indinavir sulfate) US prescribing information. Merck & Co., Inc. February, 2011.
6.Kaletra (lopinavir/ritonavir tablets) US prescribing information. Abbott Laboratories May, 2012.
7.Viracept (nelfinavir mesylate) US prescribing information. Agouron Pharmaceuticals, Inc. April, 2012.
8.Norvir (ritonavir) US prescribing information. Abbott Laboratories March, 2012.
9.Invirase (saquinavir mesylate) US prescribing information. Roche Laboratories, Inc. February, 2012.
10.Aptivus (tipranavir) US prescribing information. Boehringer Ingelheim Pharmaceuticals, Inc. February, 2012.
11.Revatio (sildenafil citrate) US prescribing information. Pfizer Inc. August, 2012.
12.Back DJ. Re: 'Pharmacokinetic interactions between sildenafil and saquinavir/ritonavir'. Br J Clin Pharmacol 2000 Aug;50(2):85.