Is There Anything Over the Counter That Works Like Viagra? There are several medications and treatments used to treat erectile dysfunction (ED, impotency), including .It works best when taken one hour before sex. How should this medicine be used? Do not stop taking sildenafil without talking to your doctor. National Library of Medicine. Nitric oxide is a substance that causes blood vessels to relax.Natural and over-the-counter alternatives for ED. Like Viagra, certain forms of sildenafil are approved to treat ED in males* ages 18 years and older. For example, sildenafil mg, mg, and. Lemonaid Sildenafil Best price for generic Viagra when bought in bulk: Optum Store Sildenafil If you are experiencing the symptoms of erectile dysfunction (ED), you may . Viagra Alternatives Compared Viagra (sildenafil) Cialis (tadalafil) Sildenafil Prescription only Viagra is used to treat erectile dysfunction (ED), but will not have any effect in the .In some patients, the use of VIAGRA with alpha-blockers can lead to a drop in blood pressure or to fainting medicines called HIV protease inhibitors, such as ritonavir Norvir , indinavir sulfate Crixivan , saquinavir Fortovase or Invirase , or atazanavir sulfate Reyataz some types of oral antifungal medicines, such as ketoconazole Nizoral and itraconazole Sporanox some types of antibiotics, such as clarithromycin Biaxin , telithromycin Ketek , or erythromycin other medicines that treat high blood pressure other medicines or treatments for ED VIAGRA contains sildenafil, which is the same medicine found in another drug called REVATIO. Your healthcare provider will discuss which dose is right for you. It comes as standard tablets, chewable tablets, and as a liquid that you swallow. This development was credited largely “due to the introduction of generic products. Also tell your doctor if you or any of your family members have or have ever had an eye disease such as retinitis pigmentosa an inherited eye condition that causes loss of vision or if you have ever had sudden severe vision loss, especially if you were told that the vision loss was caused by a blockage of blood flow to the nerves that help you see. 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. Clinical trials for MED found minimal side effects.