You should only be treated with one of these products at a time. Use the oral syringe provided with your medication to measure and take your dose. This increased blood flow can cause an erection. John’s wort. Severe liver disease.Typical dosing for Sildenafil (Viagra) The typical dose is to take 50 mg of sildenafil (Viagra) by mouth, about 1 hour before sex, as needed. The maximum recommended dose is . 25 milligrams (mg) 50 mg mg Typical dosages The following information describes commonly recommended dosages for ED. However, be sure to take the dosage your . Prescription needed: yes; Accepts insurance: limited number of carriers accepted; Location.

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