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# Item Code Package Description mexico viagra PRN use: 10 mg PO initially before sexual activity, with or without food; may be increased to 20 mg or reduced to 5 mg on basis of efficacy and tolerability; in most patients, maximum dosing frequency is once daily

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Ritonavir (600 mg b.i.d.) co-administered with Levitra 5 mg resulted in a 49-fold increase in vardenafil AUC and a 13-fold increase in vardenafil Cmax. The interaction is a consequence of blocking hepatic metabolism of vardenafil by ritonavir, a HIV protease inhibitor and a highly potent CYP3A4 inhibitor, which also inhibits CYP2C9. Ritonavir significantly prolonged the half-life of vardenafil to 26 hours. Consequently, it is recommended not to exceed a single 2.5 mg Levitra dose in a 72-hour period when used in combination with ritonavir. [See Dosage and Administration (2.4) and Warnings and Precautions (5.2).]. how cialis works ReferencesThere are some drugs that interact adversely with Cialis’ These include drugs prescribed for:The following groups of patients with cardiovascular disease were not included in clinical safety and efficacy trials for Cialis, and therefore until further information is available, Cialis is not recommended for the following groups of patients:

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