The 3 ways to administer medicines for the procedure of erectile dysfunction are orally, injected in the penis or inserting it from the urethra with the idea belonging to the penis. In march 1998, FDA approved Viagra as the first pill to treat ED. Vardenafil hydrochloride (Levitra) and tadalafil (Cialis) have also been approved. erectile dysfunction info More oral medicines are in the process of being tested for security and success. Viagra, Levitra, and Cialis are all different types of phosphodiesterase (PDE) inhibitors.These drugs release nitric oxide to stimulate blood flow and relax muscles if taken an hour before sex.However, injections trigger automatic erections quicker than oral medicines. Depending on the patient, the doctor may recommend a dose of 25, 50 or 100 mg. The recommended dose of 10mg for Levitra or Cialis could very well be greater to 20mg if needed. Some patients that have other medical conditions which decrease the body’s ability to use the drug, may take a lower dose of 5 mg. supplements for prostate Levitra is available in a 2.5 mg dose.The use of these drugs is not recommended for in excess of once on a daily basis. Use of these medications with nitrate-based medicines for example nitroglycerin for heart concerns can cause sudden drop in blood pressure.You should inform your doctor if you are taking any drugs called alpha-blockers, which are used to treat prostate enlargement or higher blood pressure level so that the ED prescription is adjusted. The main reason for it is that taking a PDE inhibitor and an alpha-blocker simultaneously (within just four hrs) can cause a unexpected drop in blood pressure level. penis pump vacuum