The orders are usually shipped in working days after the processing of the order. Before you start taking Viagra, be sure to tell your doctor if you: Have a heart disease such as irregular heartbeats, angina, chest pain or had a heart attack in the past. The information provided is for educational purposes only and is not intended to replace discussions with a healthcare provider. A phone or video consultation is sometimes required for legal purposes. All PDE5 inhibitors, including Viagra and Cialis, require a valid prescription regardless of the pharmacy or provider. The generic form of Viagra Sildenafil is available in dosage forms of 25 mg, 50 mg and mg. Especially tell your healthcare provider if you take any of the following: medicines called nitrates medicines called guanylate cyclase stimulators such as Adempas riociguat medicines called alpha-blockers, such as Hytrin terazosin HCl , Flomax tamsulosin HCl , Cardura doxazosin mesylate , Minipress prazosin HCl , Uroxatral alfuzosin HCl , Jalyn dutasteride and tamsulosin HCl , or Rapaflo silodosin.Compare prices and print coupons for Sildenafil (Generic Revatio and Viagra) and other drugs at CVS, Walgreens, and other pharmacies. Prices start at $ What Is the Cost of Viagra? Our Canadian online pharmacies is pleased to offer you the Viagra 25 mg at an unbeatable price of $ for a supply of 8 tablets which is $ . Still, if your doctor says it’s okay for you to use and you end up paying out-of-pocket, you can still get the generic for a lot less than Viagra. According to price-comparison site .