Which Is More Effective? It comes as standard tablets, chewable tablets, and as a liquid that you swallow. Use the oral syringe provided with your medication to measure and take your dose. Both Cialis and Viagra work in this way. Talk with your healthcare provider about your sex life and desired use.That’s compared with more than $50 per pill for Viagra. And while generic Revatio is available only in a mg strength—Viagra comes in , , and mg tabs—not to worry: Your doctor can. Who may not be able to take sildenafil. Sildenafil is not suitable for some people. To make sure it’s safe for you, speak to your doctor or pharmacist before taking sildenafil if you: have ever had an allergic reaction to sildenafil or any other medicine. have recently had a stroke, heart attack or a heart problem – your doctor should. Read reviews and enjoy FREE shipping on most orders when you shop for sexual health products online at CVS. Browse top brand sex products today!