In the present study, some of the respondents reported the use of alcohol and multiple illicit drugs with sildenafil in which more than half of the respondents reported they use alcohol Results Socio-Demographic Characteristics A total of 65 men had participated in the study. Alternatively, the medicine may be taken 30 minutes to 4 hours before sexual intercourse. Objectives: Explain the mechanism of action of sildenafil in the treatment of erectile dysfunction and pulmonary arterial hypertension. For treatment of erectile dysfunction: For oral dosage form tablets : Adults up to 65 years of age—50 milligrams mg as a single dose no more than once a day, 1 hour before sexual intercourse. The data was collected by two data collectors who were well aware of the questionnaire as well as the purpose of the study. In the present study, most of the respondents get sildenafil without a prescription as an OTC medication.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. Sildenafil is a medication used in the management and treatment of erectile dysfunction and pulmonary arterial hypertension. It is in the phosphodiesterase-5 inhibitor (PDE5-I) class of medications. This activity describes the indications, actions, adverse effects, and contraindications of sildenafil as an agent in the clinical setting. Knowledge . Save money on Sildenafil Citrate with your free Sildenafil Citrate coupon. Save on Sildenafil Citrate at your local pharmacy! Use your ScriptSave WellRx prescription .