You take one 2. Answer: No. Contact your medical provider if you experience any side effects during treatment. 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. Here are some key factors to consider when deciding: Pricing: Know how much your monthly supply will cost with shipping and tax.Sildenafil is available through Optum Store by prescription in , , , mg pills. Optum Store allows for bulk ordering in a , , and day supply. Extra 15% off $30 sitewide with code SAVE15; Clip your mystery deal! BOGO 50% off select Walgreens health & wellness. Sildenafil tablets come in 25mg, 50mg and mg doses. So exactly the same doses as Viagra. If you’re taking it for the first time, you’ll normally start on Sildenafil 50mg. If you take this dose and it works well but you get mild side effects, our clinician will suggest lowering your dose to 25mg.