Do not use more of it and do not use it more often than your doctor ordered. This includes prescription or nonprescription over-the-counter [OTC] medicines and herbal or vitamin supplements. If too much is used, the chance of side effects is increased. If you need emergency medical care for a heart problem, it is important that your doctor knows when you last took sildenafil. Follow the manufacturer’s directions to use and clean the oral syringe. This medicine usually begins to work for erectile dysfunction within 30 minutes after taking it. Keep from freezing. · The highest recommended Viagra dose for treating erectile dysfunction (ED) is mg per day, according to the drug’s manufacturer. Doses of mg or mg would be considered off-label. Side Effects. Dizziness, headache, flushing, or stomach upset may occur. Vision changes such as increased sensitivity to light, blurred vision, or trouble telling blue and green colors apart may. The normal dose when starting Viagra is 50 mg, as needed. The maximum dose of Viagra is mg each day. Doses above the maximum dose, such as mg per day, will increase the risk of side effects.

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