Patankar, M2000-12-082009-05-312000-12-082009-05-312000-12-08Patankar M. Sildenafil citrate. Journal of the Indian Medical Association. 2000 Dec; 98(12): 800-3, 815http://imsear.searo.who.int/handle/123456789/105561engDrug InteractionsErectile Dysfunction --drug therapyHumansMalePhosphodiesterase Inhibitors --pharmacokineticsPiperazines --pharmacokineticsPurinesSulfonesSildenafil citrate.Journal Article