Yes, if you choose to divide a Viagra pill in half, it will still work. Some people may find that they don't like how a full dose affects them and consider dividing the pill in half. It's worth noting that Viagra is available in several doses (25 mg, 50 mg, and 100 mg) so if you're prescribed a higher dose that feels like it's too much, talk with your doctor to see if they recommend lowering your dosage.