A pretest was carried out on 5 sildenafil users that came to two randomly selected pharmacies in the town. There are several ED pills available on the market, but the four most commonly prescribed ones are sildenafil Viagra , tadalafil Cialis , vardenafil Levitra , and avanafil Stendra. Do not take other medicines unless they have been discussed with your doctor. Minimal side effects: Avanafil has been reported to have a lower incidence of side effects than other PDE5 inhibitors. It is important to consult a healthcare professional to determine the most suitable options. Furthermore, they must provide a picture of their ID to prove their identity. · The effects may be increased because of slower removal of the medicine from the body. Leukemia (blood related cancer) or. Multiple myeloma (blood related cancer) or. Sickle-cell anemia (blood disorder)—Sildenafil should be used with caution in these patients as problems with prolonged erection of the penis may occur. 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 .