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This is Dr. David
have you had your testosterone levels checked? if this is low, you might benefit from testosterone supplementation to bring your levels up
what dose of viagra are you using? 50? 100mg?
have you tried a penile vacuum pump and soft silicone or rubber ring at the base of the penis to help with erections?
do you have diabetes or high blood pressure which can damage the blood flow and nerves to the penis?