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I felt slightly light-headed one time after a 150 mg dose. These effects have to do with alcohol in general and are not specific to combining Viagra with alcohol. Your heart has to work very hard to pump blood into your lungs.

Others were reported to have occurred hours to days after the use of VIAGRA and sexual activity. Viagra begins to work within about an hour and the effects can last for up to four hours.

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When the Dutch trial was stopped, roughly half of 183 pregnant women involved in the study were taking Sildenafil, participating hospital Amsterdam University's Academic Medical Centre (AMC) said. It is not possible to determine whether these events are related directly to the use of PDE5 inhibitors or to other factors [see ADVERSE REACTIONS]. A clickable logo will take you through to the regulatory body that the online pharmacy is registered with. According to the prescribing information, some of the possible side effects associated with Viagra treatment include headache, flushing, dyspepsia (upset stomach, indigestion), nasal congestion, urinary tract infections, abnormal vision, diarrhea, dizziness and rash.

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Warnings for people with certain health conditions For people with heart problems: This drug can lower your blood pressure. Viagra's meteoric rise to fame has seen it enter usage as an illicit drug. 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. VIAGRA was administered to over 3700 patients (aged 19-87 years) during pre-marketing clinical trials worldwide. A: Brand-name prescription drugs are protected under patent.

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A: The maximum recommended dose for Viagra (sildenafil), used to treat ED (erectile dysfunction), is 100 mg per day. These side effects included:   Respiratory tract infections Back pain Flu-like symptoms Joint pain.Q: Is there a less expensive substitute for Viagra? Due to age-differences in plasma protein binding, the corresponding increase in the AUC of free (unbound) sildenafil and its active N-desmethyl metabolite were 45% and 57%, respectively [see DOSAGE AND ADMINISTRATION, and Use In Specific Populations] Renal Impairment: In volunteers with mild (CLcr=50-80 mL/min) and moderate (CLcr=30-49 mL/min) renal impairment, the pharmacokinetics of a single oral dose of VIAGRA (50 mg) were not altered. Cialis (tadalafil) is known as the "weekend pill," because it lasts approximately 17 to 36 hours. What would you like to stress to women of every age about Viagra and women's sexuality? A starting dose of 25 mg should be considered in patients with severe renal impairment [see DOSAGE AND ADMINISTRATION and CLINICAL PHARMACOLOGY]. If these occur, you should contact your healthcare provider. Pharmacokinetic data from patients in clinical trials showed no effect on sildenafil pharmacokinetics of CYP2C9 inhibitors (such as tolbutamide, warfarin), CYP2D6 inhibitors (such as selective serotonin reuptake inhibitors, tricyclic antidepressants), thiazide and related diuretics, ACE inhibitors, and calcium channel blockers. It is always good to ask your doctor or pharmacist about the most common side effects that you can expect. A causal relationship between VIAGRA and these events has not been established. Excreted into human milk: Yes Comments: The effects in the nursing infant are unknown. Stephen Evans, a professor of pharmacoepidemiology at the London School of Hygiene and Tropical Medicine, said the small number of trials with pregnant women had limited the knowledge of medicines in pregnant women. "There have been other studies in this area, both involving preliminary work using animals and using pregnant women, and there was no indication that the treatment was dangerous based on previous research," Professor Evans said. In the United States, for example, 74 percent of participants responded positively.