SILDENAFIL (Viagra®) is used to treat erection problems in men. They need to know if you have any of these conditions: • anatomical deformity of the penis, Peyronie's disease, or ever had an erection that lasted more than 4 hours • benign prostatic hypertrophy (BPH) • bleeding disorder • cancer • diabetes • frequent heartburn or gastroesophageal reflux disease (GERD) • heart disease, angina, high or low blood pressure, a history of heart attack, or other heart problems • high cholesterol • kidney disease • liver disease • sickle cell disease • stomach or intestinal ulcer • stroke • eye or vision problems, including a rare inherited eye disease called retinitis pigmentosa • an unusual or allergic reaction to sildenafil, other medicines, foods, dyes, or preservatives • pregnant or trying to get pregnant • breast-feeding Take sildenafil tablets by mouth. The dose is usually taken 1 hour before sexual activity. Contact your pediatrician or health care professional regarding the use of this medicine in children. NOTE: Do not take doses of sildenafil higher than 25 mg within 4 hours of taking alpha blockers, such as alfuzosin (Uro Xatral®), doxazosin (Cardura®), prazosin (Minipress®), or terazosin (Hytrin®). You should not take this dose more than once per day. • bosentan • certain drugs used for seizures such as carbamazepine, phenytoin, and phenobarbital • certain drugs used for fungal or yeast infections, such as fluconazole, ketoconazole, and voriconazole • certain drugs for the treatment of HIV infection or AIDS • cimetidine • cisapride • clarithromycin • diltiazem • erythromycin • grapefruit juice • mibefradil • monoamine oxidase inhibitors (Azilect®, Eldepryl®, Emsam®, Marplan®, Nardil®, Parnate®, Zelapar™) • nitroprusside • rifabutin • rifampin • quinidine • some drugs for treating depression, anxiety or other mood problems (examples: fluoxetine, fluvoxamine, nefazodone) • verapamil Tell your prescriber or health care professional about all other medicines you are taking, including non-prescription medicines, nutritional supplements, or herbal products. • nitroglycerin-type drugs for the heart or chest pain such as amyl nitrite, isosorbide dinitrate, isosorbide mononitrate, nitroglycerin, even if these are only taken occasionally • alpha blockers, used for high blood pressure or an enlarged prostate. Also tell your prescriber or health care professional if you are a frequent user of drinks with caffeine or alcohol, if you smoke, or if you use illegal drugs. Check with your health care professional before stopping or starting any of your medicines. Side effects that you should report to your prescriber or health care professional as soon as possible: • changes in hearing such as loss of hearing or ringing in ears • changes in vision such as loss of vision, blurred vision, eyes being more sensitive to light, or trouble telling the difference between blue and green objects or objects having a blue color tinge to them • difficulty breathing, shortness of breath • chest pain or palpitations • prolonged erection (lasting longer than 4 hours) • skin rash, itching • diarrhea • dizziness • flushing • headache • indigestion • nasal congestion If you notice any changes in your vision while taking this drug, notify your prescriber or health care professional as soon as possible. Stop using sildenafil right away if you have a loss of sight in one or both eyes. Contact you physician immediately if the erection lasts longer than 4 hours or if it becomes painful. This may be a sign of priapism and must be treated immediately to prevent permanent damage. where to buy generic viagra in singapore Sildenafil is a prescription medicine that is used to treat the inability to keep an enlarged and rigid state of the penis during sexual activity. This condition is known as erectile dysfunction or ED. This medicine helps by relaxing muscles and therefore allowing the flow of blood into the penis. This helps a man to keep the penis in an enlarged and rigid state during sexual excitement. Sildenafil belongs to the Phosphodiesterase 5 Inhibitors class of medicines. Phosphodiesterase 5 (PDE5) inhibitors are a group of targeted therapy medicines that used to treat people with high blood pressure. PDE 5 inhibitors are also used to treat erectile dysfunction. 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A lot of anxiety came with that when it came to sex and I think it just made it worse and worse (I stress pretty easily) got all the tests done on prostate, testosterone, etc. While these reviews might be helpful, they are not a substitute for the expertise, skill, knowledge and judgement of healthcare practitioners in patient care."I don't necessarily need this medication each time I have intercourse but when I do use it I have fantastic results. This med has worked every time and the girls I've been with, young and old, have never been let down with the erections I get with this medication. everything looked pretty good, my doctor recommended this. It varies from person to person and their medical conditions.""So I’m younger then a lot of the posts on here, but for whatever reason for the past couple years I had never been fully hard, and recently I wasn’t able to get hard at all. I took 60mg and 45 minutes in I could tell it was working. 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