Sildenafil (for PAH)/Selected 3A4 Inhibitors
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.
Medical warning:
Severe. These medicines may interact and cause very harmful effects and are usually not taken together. Contact your healthcare professional (e.g. doctor or pharmacist) for more information.
How the interaction occurs:
Your HIV medicine 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 right away that you are taking these medicines together and the condition for which you are taking sildenafil. These medicines are not usually used together in patients with a condition called pulmonary arterial hypertension (PAH). 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.
References:
1.Reyataz (atazanavir sulfate) US prescribing information. Bristol-Myers Squibb Company January, 2013.
2.Prezista (darunavir) US prescribing information. Tibotec Inc. February, 2013.
3.Lexiva (fosamprenavir calcium) US prescribing information. GlaxoSmithKline February, 2013.
4.Crixivan (indinavir sulfate) US prescribing information. Merck & Co., Inc. February, 2011.
5.Kaletra (lopinavir/ritonavir tablets) US prescribing information. Abbott Laboratories January, 2013.
6.Viracept (nelfinavir mesylate) US prescribing information. Agouron Pharmaceuticals, Inc. April, 2012.
7.Norvir (ritonavir) US prescribing information. Abbott Laboratories November, 2012.
8.Invirase (saquinavir mesylate) US prescribing information. Roche Laboratories, Inc. February, 2012.
9.Aptivus (tipranavir) US prescribing information. Boehringer Ingelheim Pharmaceuticals, Inc. February, 2012.
10.Stribild (elvitegravir, cobicistat, emtricitabine, tenofovir) prescribing information. Gilead Sciences, Inc. August, 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.
13.Viagra (sildenafil) US prescribing information. Pfizer Inc. January, 2011.
