Using alcohol or tobacco with certain medicines may also cause interactions to occur. If you are taking sildenafil to treat erectile dysfunction, follow your doctor’s directions and the guidelines in this paragraph. 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. Dosing The dose of this medicine will be different for different patients. Use protective measures and ask your doctor if you have any questions about this. Your primary care doctor should always know what medications you’re taking, including ED pills prescribed by another provider. The following nonprescription or herbal products may interact with sildenafil: cimetidine Tagamet HB , St.Get a sildenafil (Viagra) prescription and pills online for ED Connect directly with a doctor for a discreet virtual ED consult Get a prescription for FDA-approved Sildenafil (generic . The dose of Cialis you need will depend on whether you’re taking it daily or as needed. Daily doses are often between and 5 milligrams (mg). The as-needed dose is usually 10 mg but can range from 5–20 mg. The typicaldose of Viagra is 50 mg. However, the dosage can range from 25– mg. AdChoose our efficient document courier for trusted document delivery solutions. Deliver your medicines easily with uParcel, a same day delivery tech company in test1.rue catalog: Same Day Delivery, 3 hour Delivery, Corporate Bulk Delivery.