This is a type of high blood pressure that occurs between the heart and the lungs. When hypertension occurs in the lungs, the heart must work harder to pump enough blood through the lungs. Sildenafil works on the PDE5 enzyme in the lungs to relax the blood vessels. This will increase the supply of blood to the lungs and reduce the workload of the heart. In 1994, Pfizer filed a patent covering the use of sildenafil to treat erectile dysfunction. Teva sued to have the latter patent invalidated, but Pfizer prevailed in an August 2011 federal district court case.
For a time, the generic was not available in the same dosages as branded Viagra, so using dosages typically required for treating ED required patients to take multiple pills. In February 2007, it was announced that Boots, the UK pharmacy chain, would try over-the-counter sales of Viagra in stores in Manchester, England. kamagra shop deutschland Men between the ages of 30 and 65 would be eligible to buy four tablets after a consultation with a pharmacist. While the sale remains subject to a consultation with a pharmacist, the other restrictions from the trial have been removed, allowing customers over the age of 18 to purchase an unlimited number of pills. The decision was made, in part, to reduce online sales of counterfeit and potentially dangerous erectile dysfunction treatments.
Sildenafil, sold under the brand name Viagra, among others, is a medication used to treat erectile dysfunction and pulmonary arterial hypertension. It is unclear if it is effective for treating sexual dysfunction in women. Onset is typically within twenty minutes and lasts for about two hours. Using this medicine with any of the following medicines may cause an increased risk of certain side effects, but using both drugs may be the best treatment for you.
Adults 65 years of age and older—25 mg as a single dose no more than once a day, 1 hour before sexual intercourse. Alternatively, the medicine may be taken 30 minutes to 4 hours before sexual intercourse. Sildenafil is used to treat men who have erectile dysfunction . Sildenafil belongs to a group of medicines called phosphodiesterase 5 inhibitors. These medicines prevent an enzyme called phosphodiesterase type-5 from working too quickly.
If you need emergency medical care for a heart problem, it is important that your doctor knows when you last took sildenafil. The dose of this medicine will be different for different patients. Follow your doctor’s orders or the directions on the label. The following information includes only the average doses of this medicine. If your dose is different, do not change it unless your doctor tells you to do so. Read the directions carefully before you start using sildenafil and each time you get a refill of your medicine.
Mayo Clinic is a nonprofit organization and proceeds from Web advertising help support our mission. Mayo Clinic does not endorse any of the third party products and services advertised. Sildenafil should not be used with any other medicine or device that causes erections. Throw away any unused mixed Revatio® oral liquid after 60 days. Use only the brand of this medicine that your doctor prescribed. If you are using the oral liquid, shake the bottle well for at least 10 seconds before measuring each dose.
Sildenafil treats erectile dysfunction by increasing blood flow to the penis during sexual stimulation. Sildenafil treats PAH by relaxing the blood vessels in the lungs to allow blood to flow easily. Sexual activity may be a strain on your heart, especially if you have heart disease. If you experience chest pain, dizziness, or nausea during sexual activity, call your doctor immediately and avoid sexual activity until your doctor tells you otherwise. Tell your doctor if you smoke, if you have ever had an erection that lasted for several hours, and if you have recently lost a large amount of body fluids . This can happen if you are sick with fever, diarrhea, or vomiting; sweat a lot; or do not drink enough liquids.
If both medicines are prescribed together, your doctor may change the dose or how often you use one or both of the medicines. Although certain medicines should not be used together at all, in other cases two different medicines may be used together even if an interaction might occur. In these cases, your doctor may want to change the dose, or other precautions may be necessary. When you are taking this medicine, it is especially important that your healthcare professional know if you are taking any of the medicines listed below. The following interactions have been selected on the basis of their potential significance and are not necessarily all-inclusive. Tell your doctor if you have ever had any unusual or allergic reaction to this medicine or any other medicines.