Common side effects include headache, facial flushing, indigestion, and dizziness. Make sure to get an estimate of when you can expect your prescription in the mail. The generic versions are just as effective and much less expensive. This is important for your overall health and safety, as certain medications can negatively interact with each other or cause existing conditions to worsen. Erectile dysfunction medications require a prescription from a licensed provider.Best Low Cost: GoodRx Fastest Delivery: Blink Health: Sesame Sign Up Now Key Specs Cost: Consultation prices vary based on the prescriber; $5 generic prescriptions Medical Consultation Required: Yes Medications Prescribed: Viagra, Cialis, sildenafil, tadalafil Generic offered: Yes Why We Chose It. You can bring prescription medications approved by the Food and Drug Administration (FDA) from Mexico into the United States. But there are limits. The U.S. Customs and Border Protection (CBP) will generally prohibit a supply for more than 90 days to come across the border. Depending on your symptoms and needs, you may be prescribed Viagra, sildenafil, Cialis, tadalafil, Stendra, paroxetine, or a combination of tadalafil and sildenafil, available as mints or pills. Prices range from $3 to $ per dose or $82 to $ for a monthly supply, depending on the medication.