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Each oral medicine for ED has a slightly different chemical makeup. These small differences affect the way each medication works, such as how quickly it takes effect and wears off, and the possible side effects. Your doctor or other health care professional can recommend one for you based on these factors, other health conditions you have and any other medicines you take.

The highest available Viagra dosage is 100 mg, but that doesn’t mean 100 mg is suitable for you. When it comes to medication, more isn't always better (or more effective). Like any medication, Viagra comes with potential risks, side effects, and contraindications.

Viagra must not be used where sexual activity is inadvisable (e.g. men with severe heart disease such as unstable angina or severe heart failure). It must also not be taken by patients who have ever had loss of vision because of a problem with blood flow to the nerve in the eye (non-arteritic anterior ischemic optic neuropathy or NAION). For the full list of restrictions, see the package leaflet.

This section covers common questions about the dosage of Viagra. Across all trials, VIAGRA improved the erections of 43% of radical prostatectomy patients compared to 15% on placebo. One-third to one-half of the subjects in these studies reported successful intercourse at least once during a 4-week, treatment-free run-in period. There was no impairment of fertility in rats given sildenafil up to 60 mg/kg/day for 36 days to females and 102 days to males, a dose producing an AUC value of more than 25 times the human male AUC. In a study of healthy male volunteers, sildenafil (100 mg) did not affect the steady state pharmacokinetics of the HIV protease inhibitors, saquinavir and ritonavir, both of which are CYP3A4 substrates. In healthy male volunteers, there was no evidence of a clinically significant effect of azithromycin (500 mg daily for 3 days) on the systemic exposure of sildenafil or its major circulating metabolite.

If you feel that sildenafil is not effective, you should discuss increasing the dose or trying a new treatment with your doctor or pharmacist. Your doctor or pharmacist may suggest that you try sildenafil 100mg tablets if the 50mg dose is not working well for you and you are not experiencing any side effects. There is a higher chance of experiencing side effects as you increase the strength. You should read the patient information for a full list of side effects. If you experience any side effects, you should inform your doctor or pharmacist, or in serious cases, seek urgent medical assistance. You should always inform us if you have experienced any side effects from taking sildenafil.

Yes, age is something doctors keep in mind when deciding on the appropriate sildenafil dosage. Older people are generally prescribed Viagra at a lower dose because of their reduced kidney and liver function. As a result, drug metabolism slows down with age