Often, these are prescribed for chest pain called angina. These are commonly prescribed for an enlarged prostate or male pattern baldness. You can take it in a small dose daily or in a larger dose as needed. Do not stop taking sildenafil without talking to your doctor. If you don’t have any health insurance, consider purchasing a plan. Use the oral syringe provided with your medication to measure and take your dose.Oral medicines for ED usually work well and cause few side effects. The four main medicines taken by mouth for erectile dysfunction are: Avanafil (Stendra). Sildenafil . The safest way to get a prescription for Viagra is from your doctor. You can even do this over a telehealth call (on the phone or computer) in many cases, although for your first . Check Your Pills Check your pills to be sure they’re brand-name VIAGRA—not the generic. If you think your brand-name prescription has been filled with a generic, talk to your .