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During 3 to 6 months of double-blind treatment or longer-term (1 year), open-label studies, few patients withdrew from active treatment for any reason, including lack of effectiveness. At the end of the long-term study, 88% of patients reported that Viagra improved their erections. how long viagra last Based on effectiveness and toleration, the dose may be increased to a maximum recommended dose of 100 mg or decreased to 25 mg.

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Viagra can cause serious side effects. Rarely reported side effects include: where can i buy levitra Prolonged ErectionIf you are taking sildenafil for PAH, you should know that sildenafil controls PAH but does not cure it. Continue to take sildenafil even if you feel well. Do not stop taking sildenafil without talking to your doctor.

A starting dose of 5 mg is recommended in patients with moderate hepatic impairment (Child-Pugh B) and the maximum dose should not exceed 10 mg. In volunteers with moderate hepatic impairment, the Cmax and AUC following a 10 mg vardenafil dose were increased by 130% and 160%, respectively, compared to healthy control subjects. [See Warnings and Precautions (5.8) and Dosage and Administration (2.3).]Cardiovascular: angina pectoris, AV block, migraine, syncope, tachycardia, palpitation, hypotension, postural hypotension, myocardial ischemia, cerebral thrombosis, cardiac arrest, heart failure, abnormal electrocardiogram, cardiomyopathy. viagra facts Cheap and efficient Canadian Cialis

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buying cialis Talk to your doctor to decide if Levitra is right for you.So, the answer to the first and most important of the above questions is this: alcohol does affect the effectiveness of Cialis. Unfortunately, it can lessen the effect of the drug or make it stop working at all. However, the good news is that it’s not all as bad as it might seem to be. The point is that people on Cialis are advised to refrain from drinking TOO MUCH alcohol, not to fully avoid it.

fluoxetine (Prozac, Sarafem)?Co-administration of ritonavir, a strong CYP3A4 inhibitor, greatly increased the systemic exposure of sildenafil (11-fold increase in AUC). It is therefore recommended not to exceed a maximum single dose of 25 mg of Viagra in a 48 hour period [see Dosage and Administration (2.4), Warnings and Precautions (5.6), Clinical Pharmacology (12.3)].