If you become pregnant while taking sildenafil, call your doctor. 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. Your doctor will tell you not to take sildenafil if you are taking street drugs containing nitrates. In some patients, the use of VIAGRA with alpha-blockers can lead to a drop in blood pressure or to fainting medicines called HIV protease inhibitors, such as ritonavir Norvir , indinavir sulfate Crixivan , saquinavir Fortovase or Invirase , or atazanavir sulfate Reyataz some types of oral antifungal medicines, such as ketoconazole Nizoral and itraconazole Sporanox some types of antibiotics, such as clarithromycin Biaxin , telithromycin Ketek , or erythromycin other medicines that treat high blood pressure other medicines or treatments for ED VIAGRA contains sildenafil, which is the same medicine found in another drug called REVATIO. Use the oral syringe provided with your medication to measure and take your dose.Can I buy generic Viagra without a prescription? No. In most countries, including the United States, Viagra is not available without a prescription. The safest way to get a prescription for Viagra is from your doctor. You can even do this over a telehealth call (on the phone or computer) in many cases, although for your first . How to Get Generic Viagra – Consumer Reports. An inexpensive blood pressure medication might be an option for some men who suffer from erectile dysfunction. By .

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