It depends on the goodwill of the pharmacist, the regulation in Portugal is that a pharmacist can not sell a prescription drug without a prescription. Bring an old prescription to prove .Shake the liquid well for 10 seconds before each use to mix the medication evenly. Tell your doctor or pharmacist if you are taking nitrates medications for chest pain such as isosorbide dinitrate Isordil , isosorbide mononitrate Monoket , and nitroglycerin Nitromist, Nitro-Dur, Nitrostat. Some people buy sildenafil online without a prescription. If you’re not sure if you’re taking a nitrate, ask your doctor or pharmacist. If you prefer, you may contact the U. Key facts It usually takes 30 to 60 minutes for sildenafil to work for erectile dysfunction. Sildenafil usually should not be taken more than once every 24 hours.Ad多様なメジャー通貨やエキゾチック通貨を取引可能. 高機能ツールが無料で利用でき、初めてのユーザーでも使いやすい. 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 mg. Don’t take sildenafil (Viagra) more than once daily (at any dose). Written by Brian Leonard, PharmD, BCACP, BCGP. Sildenafil (Viagra) is a medicine used to treat erectile dysfunction (ED, also called impotence). Sildenafil works by helping to relax the blood vessels in the penis, allowing more blood to flow in and cause an erection. You should take sildenafil about an hour before planned sexual activity, so it has time to work.Sildenafil may not be safe to take for people with certain medical conditions including: a past history of stroke or heart attack in the last 6 months retinitis pigmentosa an eye disease It can also interact with many other medicines, particularly nitrates used in heart disease , amyl nitrite and blood pressure medicines. Sildenafil treats erectile dysfunction by increasing blood flow to the penis during sexual stimulation. Read more on male sexual health on the Sexual Health Australia site. Tell your doctor or pharmacist if you are taking nitrates medications for chest pain such as isosorbide dinitrate Isordil , isosorbide mononitrate Monoket , and nitroglycerin Nitromist, Nitro-Dur, Nitrostat. The most common side effects are headaches, feeling sick, indigestion and dizziness. If you have erection problems sildenafil works by temporarily increasing blood flow to your penis when you get sexually excited. What special dietary instructions should I follow?