Popular ED medications found online include: Viagra sildenafil : As the first FDA-approved PDE5 inhibitor for ED, sildenafil is taken 30 minutes to four hours before sexual intercourse to help achieve and maintain an erection. Information Access: Online pharmacies often provide detailed information about the drug, including its uses, side effects, and contraindications. Can I trust online reviews about Cialis? This medication is taken with or without food an hour before sex. They are PDE5 inhibitors that allow for increased blood flow to the penis, leading to more frequent and harder erections. Follow the directions on your prescription label carefully, and ask your doctor or pharmacist to explain any part you do not understand.Side Effects. Headache, stomach upset, back pain, muscle pain, stuffy nose, flushing, or dizziness may occur. If any of these effects last or get worse, tell your doctor or pharmacist promptly. To. AdSildaristo online bestellen. % diskret & vertraulich. Zertifizierte Versandapotheke. Erektionsstörungen sicher und effektiv behandeln. Inklusive Rezeptausstellung. The dose of Cialis you need will depend on whether you’re taking it daily or as needed. Daily doses are often between and 5 milligrams (mg). The as-needed dose is usually 10 mg but can range from 5–20 mg. The typicaldose of Viagra is 50 mg. However, the dosage can range from 25– mg.