Getting a Viagra (sildenafil) prescription is straightforward: you need a medical evaluation, either in person or through a telehealth platform, where a licensed provider confirms that erectile dysfunction medication is safe for you. The process typically takes one appointment, and most men leave with a prescription the same day.
What the Appointment Involves
A provider will ask about your medical history, sexual history, and any medications you currently take. Expect questions about how long you’ve had difficulty getting or maintaining erections, whether it happens in certain situations or all the time, and whether you have any underlying conditions like diabetes or heart disease. These aren’t just formalities. Erectile dysfunction is considered a risk marker for cardiovascular disease and other health problems, so the provider is screening for conditions that may need their own treatment.
You’ll likely have a physical exam focusing on blood vessel and nerve function, hormonal signs, and the penis itself. The American Urological Association recommends a morning blood draw to check testosterone levels, and your provider may also order blood sugar, thyroid, or prostate tests depending on your age and risk factors. Most men don’t need imaging or specialized tests. Those are reserved for cases where the cause of ED is unclear or doesn’t respond to initial treatment.
Some providers use a short validated questionnaire to gauge the severity of your ED. This helps them track whether treatment is working over time and adjust your plan if needed.
Who Can Prescribe It
Any licensed prescriber can write a sildenafil prescription. That includes your primary care doctor, a urologist, or a nurse practitioner. You don’t need to see a specialist first. Most men start with their regular doctor, and if the standard approach works, that’s often the only provider they need.
Telehealth Is a Common Option
Platforms like Hims, Roman, and BlueChew have made the process more private and convenient. The typical flow starts with an online questionnaire about your health and medical history. You upload a photo ID to verify your identity, then a provider licensed in your state reviews your information and follows up with messages or a video visit. Some states require a live video chat; others allow the consultation to happen entirely through messaging.
The provider on the other end isn’t always a doctor. It may be a nurse practitioner or physician assistant, which is standard and legal. If they determine sildenafil is appropriate, the prescription is sent to a pharmacy (sometimes the platform’s own pharmacy, sometimes one you choose). The whole process can take as little as a few hours, though some platforms quote 24 to 48 hours.
To verify that an online pharmacy is legitimate, look for a few things: it requires a real prescription, lists a U.S. physical address and phone number, has a licensed pharmacist available, and is licensed with a state board of pharmacy. If a site lets you buy Viagra without any medical questions, that’s a red flag.
Who Can’t Take Sildenafil
The most important safety rule is absolute: sildenafil cannot be combined with nitrate medications. This includes nitroglycerin tablets or patches, isosorbide, and recreational use of amyl nitrite (“poppers”). Combining these drops blood pressure to dangerous levels. If you take nitrates for chest pain or a heart condition, sildenafil is off the table, and your provider will discuss alternatives.
Sildenafil is also contraindicated with a class of drugs called GC stimulators, used for pulmonary hypertension. Beyond specific drug interactions, providers will assess your cardiovascular health more broadly. If sexual activity itself poses a risk because of an unstable heart condition, ED medications generally aren’t recommended until that’s addressed.
Dosage and What to Expect
Sildenafil comes in 25 mg, 50 mg, and 100 mg tablets. The standard starting dose is 50 mg, taken when needed. Your provider will adjust up or down based on how well it works and whether you experience side effects. You take it roughly 30 to 60 minutes before sexual activity, though some men report onset in as little as 12 minutes. The median time to onset is about 27 minutes.
The commonly cited window of effectiveness is about four hours, which tracks with the drug’s half-life. But research shows the picture is more generous than that. In one study, 97% of men achieved erections sufficient for intercourse at one hour after dosing, and 74% still could at the 12-hour mark. Sildenafil doesn’t cause an automatic erection. It works only with sexual stimulation, making the experience feel more natural than many men expect.
Cost and Insurance Coverage
Brand-name Viagra is expensive, often around $85 per pill without insurance. Generic sildenafil, which is chemically identical, can cost under $1 per pill at some pharmacies, though prices vary widely. Shopping around or using a discount tool like GoodRx can make a significant difference.
Private insurance coverage varies. Some plans cover generic sildenafil but may require prior authorization or limit the number of pills per month. Medicare Part D, however, specifically excludes coverage for drugs used to treat erectile dysfunction. This exclusion has been in place since 2007. Some Medicare Advantage plans offer supplemental benefits that may cover ED drugs, but standard Part D does not.
Telehealth platforms typically charge a consultation fee (often $15 to $50) plus the cost of the medication. Because they frequently dispense generic sildenafil through their own pharmacies, the total out-of-pocket cost can be competitive with, or cheaper than, using insurance at a retail pharmacy.
If the First Approach Doesn’t Work
Sildenafil works for most men, but not all. If the starting dose isn’t effective, your provider will likely increase it to 100 mg before considering other options. Men with low testosterone sometimes find that sildenafil works better when combined with testosterone therapy, which your provider can assess through blood work.
If sildenafil doesn’t do the job at any dose, other medications in the same class work through the same mechanism but have different onset times and durations. Beyond pills, options include injection therapy, vacuum devices, and surgical implants, though most men never need to explore those. The key is circling back with your provider rather than assuming nothing will help.