At Innerbody Research, we extensively test each health service we review, including ED medication services. All told, our team has collectively spent nearly 300 hours testing and researching these companies to provide an accurate, unbiased analysis of how they stack up, free of marketing jargon and gimmicks.
Tadalafil (active ingredient in Cialis) is a FDA-approved PDE5 inhibitor used for the treatment of erectile dysfunction (ED). Tadalafil lasts up to 36 hours and food does not affect the effectivness of Tadalafil. It can be taken on a as-needed basis or daily (depending on which dosage you take). Tadalafil does not increase your sex drive. Tadalafil is not recommended for men who have uncontrolled blood pressure (high or low), or have had a heart attack or stroke within the past 6 months. Please see the detailed drug safety information for all the risks and side effects of using Tadalafil. Dose Price2.5mg$0.50 per tablet5mg$0.50 per tablet10mg$1 per tablet20mg$1 per tablet Drug Safety Information – Tadalafil Tadalafil – IMPORTANT SAFETY INFORMATION take any medicines called nitrates, often prescribed for chest pain, or guanylate cyclase stimulators like Adempas (riociguat) for pulmonary hypertension. Your blood pressure could drop to an unsafe levelare allergic to Tadalafil or any of the ingredients in Tadalafil an erection that will not go away (priapism). If you have an erection that lasts more than 4 hours, get medical help right away. If it is not treated right away, priapism can permanently damage your penissudden vision loss in one or both eyes. Sudden vision loss in one or both eyes can be a sign of a serious eye problem called non-arteritic anterior ischemic optic neuropathy (NAION). Stop taking Tadalafil and call your healthcare provider right away if you have any sudden vision losssudden hearing decrease or hearing loss. Some people may also have ringing in their ears (tinnitus) or dizziness. If you have these symptoms, stop taking Tadalafil and contact a doctor right away have or have had heart problems such as a heart attack, irregular heartbeat, angina, chest pain, narrowing of the aortic valve, or heart failurehave had heart surgery within the last 6 monthshave pulmonary hypertensionhave had a strokehave low blood pressure, or high blood pressure that is not controlledhave a deformed penis shapehave had an erection that lasted for more than 4 hourshave problems with your blood cells such as sickle cell anemia, multiple myeloma, or leukemiahave retinitis pigmentosa, a rare genetic (runs in families) eye diseasehave ever had severe vision loss, including an eye problem called NAIONhave bleeding problemshave or have had stomach ulcershave liver problemshave kidney problems or are having kidney dialysis have any other medical conditions

Scientific research has also found two important chemicals in this ingredient called deoxyadenosine and cordycepic acid. These chemicals have an direct effect on that area of the brain which control the sexual desires.
Sildenafil (active ingredient in Viagra) is a FDA-approved PDE5 inhibitor used for the treatment of erectile dysfunction (ED). Sildenafil is taken on an as-needed basis and lasts about 4-6 hours. Sildenafil generally starts working in as little as 30 minutes and is best taken on an empty stomach. Sildenafil does not increase your sex drive. Please see the detailed drug safety information for all the risks and side effects of using Sildenafil. Dose Price20mg$0.50 per tablet25mg$1 per tablet50mg$1 per tablet100mg$1 per tablet take any medicines called nitrates, often prescribed for chest pain, or guanylate cyclase stimulators like Adempas (riociguat) for pulmonary hypertension. Your blood pressure could drop to an unsafe levelare allergic to sildenafil, as contained in Sildenafil and REVATIO, or any of the ingredients in Sildenafil