Ask your pharmacist or doctor for a copy of the manufacturer’s information for the patient. They include dutasteride Avodart, Jalyn and finasteride Propecia, Proscar. Side effects Side effects of oral ED medicines are often mild. Medicines that block an enzyme called CYP3A4. They enhance the effects of a chemical the body makes that relaxes muscles in the penis, called nitric oxide.Brand names for sildenafil include Viagra, Revatio, and Liqrev. The cost for sildenafil oral tablet mg is around $10 for a supply of 2 tablets, depending on the pharmacy you visit. Quoted prices are for cash-paying customers and are not valid with insurance plans. How much does Viagra cost online? What dosage is available? Hims: yes: yes – starting at $ per dose of Viagra – starting at $4 per dose of sildenafil, depending on dosage: . In general, a lower dose (5mg) that’s meant for daily use can cost around $20 to $32 per dose, and a higher dose (10mg and 20mg) meant for “as-needed” use can cost around $80 – $85 per dose.