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If you have questions about Viagra dosages based on your age, talk with your doctor or pharmacist. Based on how well you respond to this dosage and any side effects you have, your doctor may either increase your dose up to the maximum of 100 mg or decrease your dose to 25 mg. Below are details about Viagra dosages commonly used to treat erectile dysfunction (ED).

Sometimes a lower starting dose of 25mg will be suggested by a clinician. This route may be considered if you’re already taking certain medications for the treatment of kidney, liver or heart conditions. Or if your previous tolerance of sildenafil citrate 50mg was low.

Caution is advised when PDE5 inhibitors are co-administered with alpha-blockers. PDE5 inhibitors, including VIAGRA, and alpha-adrenergic blocking agents are both vasodilators with blood pressure lowering effects. When vasodilators are used in combination, an additive effect on blood pressure may occur. Using this medicine with any of the following medicines may cause an increased risk of certain side effects, but using both drugs may be the best treatment for you.

A stronger CYP3A4 inhibitor such as ketoconazole or itraconazole could be expected to have greater effect than that seen with saquinavir. The results from this pilot study are shown in Table 3