If you buy sildenafil for erectile dysfunction, it can also be known by the brand names Viagra, Aronix, Liberize and Nipatra. Pharmacokinetic data from patients in clinical trials showed no effect on sildenafil pharmacokinetics of CYP2C9 inhibitors such as tolbutamide, warfarin , CYP2D6 inhibitors such as selective serotonin reuptake inhibitors, tricyclic antidepressants , thiazide and related diuretics, ACE inhibitors, and calcium channel blockers. Prolonged erections can be dangerous. It can be dangerous to take sildenafil if you also take medicines called nitrates often given for chest pain. Mean sildenafil plasma concentrations measured after the administration of a single oral dose of mg to healthy male volunteers is depicted below: Figure 5: Mean Sildenafil Plasma Concentrations in Healthy Male Volunteers. This is consistent with ritonavir’s marked effects on a broad range of P substrates. As part of the sale, it is recommended that you document this with your GP and have a health-check within 6 months if the regular need for the medication is required.AdSaving is as easy as Join the millions of American who save every month. GoodRx® finds the lowest prices at every pharmacy near you. See how much you can save!4/5 (1, reviews)GoodRx helps people pay for Rx they otherwise couldn’t afford. – Patch. AdGet Deals and Low Prices On male enhancements On Amazon. Read Customer Reviews & Find Best Sellers. Free, Easy Returns On Millions Of Items.1M+ visitors in the past month. Tell your healthcare provider about all the medicines you take,* including prescription and over-the-counter medicines, vitamins, and herbal supplements. VIAGRA may affect the way other medicines work, and other medicines may affect the way VIAGRA works causing side effects. Especially tell your healthcare provider if you take any of the following.