Who can and cannot take sildenafil Who can take sildenafil Most men aged 18 and over can take sildenafil for erectile dysfunction. Be honest and open about any issues so you can work past them and hopefully have better sex. Viagra is not for use by females. Often, these are prescribed for chest pain called angina. Doses for children can range from 10mg to 20mg taken 3 times a day, depending on their weight. An inherited eye disease that affects the retina.The VIAGRA Savings Card allows eligible patients to save 50% on up to 12 prescriptions of brand-name VIAGRA—and could save up to $4, a year. If you have a prescription for brand-name VIAGRA, you can use the card for every fill through December 31, * *Terms and conditions apply. Sildenafil tablets for erectile dysfunction come in different strengths ranging from 25mg to mg. The usual dose is 50mg, when you need it. Do not take it more than once a day. The dose can be increased to mg or decreased to 25mg depending on its effect. Take sildenafil up to 4 hours before you want to have sex. AdGet Deals and Low Prices On pharmacy prescriptions At Amazon. We Offer an Extensive Selection Of Everything Else Store At Amazon. Order Today!Services: Pet Supplies, Pharmacy, Medical Care, Anxiety, Hypothyroidism and more.