A small placebo-controlled week study performed on men with erectile dysfunction used the Self Esteem and Relationship SEAR questionnaire to assess the impact of sildenafil treatment on patients. Never take 2 doses at the same time. Talk to your doctor if you take too much sildenafil and you’re worried about any of these side effects: headaches. Do not use a kitchen teaspoon as it will not measure the right amount. Dosage and strength for erectile dysfunction Sildenafil tablets for erectile dysfunction come in different strengths ranging from 25mg to mg. For erectile dysfunction, it’s best to take sildenafil on an empty stomach. This activity describes the indications, actions, adverse effects, and contraindications of sildenafil as an agent in the clinical setting.Viagra can decrease blood flow to the optic nerve of the eye, causing sudden vision loss. This has occurred in a small number of people taking sildenafil, most of whom also had heart disease, diabetes, high blood pressure, high cholesterol, or certain pre-existing eye problems, and in those who smoked or were over 50 years old. For daily use, Goldstein said, the generic form, sildenafil, comes in mg tablets. “We prescribe one mg tablet a night, a classic dose,” he said. “Should they wish to have sex, they. Sildenafil is used to treat erectile dysfunction (ED) and to reduce blood pressure in pulmonary arterial hypertension (PAH). It is taken when needed for ED and daily for PAH. A headache, stomach upsets, and flushing are the main side effects, and it should not be taken within 24 hours of a nitrate. 5. Tips.