Several prescription medications work the same way Viagra does, and they’re all available in affordable generic forms. Viagra (sildenafil) belongs to a class of drugs called PDE5 inhibitors, and three other FDA-approved medications share that same mechanism: tadalafil, vardenafil, and avanafil. Beyond these, a range of supplements, lifestyle changes, and medical procedures can also improve erectile function to varying degrees.
Other Prescription PDE5 Inhibitors
All four PDE5 inhibitors work by relaxing blood vessels in the penis, allowing more blood flow during arousal. The differences come down to timing, duration, and flexibility.
Tadalafil is the most popular alternative. Its standout feature is duration: it stays active in your body for up to 36 hours, compared to roughly 4 to 6 hours for sildenafil. It can also be taken as a low daily dose, so you don’t need to plan around a pill. That daily option makes it appealing for men who want spontaneity. Through online pharmacies and discount coupons, generic tadalafil can cost as little as $8 to $20 per month for a daily prescription.
Vardenafil is taken about an hour before sex, similar to sildenafil, and works for 4 to 6 hours. Some men find it effective at lower relative doses, and it’s also available as an orally dissolving tablet.
Avanafil is the newest option. It was designed to work faster, with some men noticing effects in as little as 15 minutes. It also tends to cause fewer side effects because it’s more selective in what it targets.
All four drugs are equally effective for most men. The choice usually comes down to how often you have sex, whether you prefer a daily pill or an as-needed one, and how your body handles side effects like headaches, flushing, or nasal congestion.
One Critical Safety Rule
Every PDE5 inhibitor, not just Viagra, is dangerous when combined with nitrate medications. Nitrates (commonly prescribed for chest pain) are also vasodilators, and combining them with any of these drugs creates a synergistic drop in blood pressure that can be life-threatening. This applies to all four prescription options equally. If you take nitrates in any form, including recreational use of amyl nitrite (“poppers”), PDE5 inhibitors are off the table.
Supplements With Clinical Evidence
No supplement works as powerfully or reliably as prescription medication, but two have decent clinical data behind them.
L-Arginine
L-arginine is an amino acid your body uses to produce nitric oxide, the molecule that triggers erections by relaxing blood vessel walls. In a randomized, placebo-controlled trial, men with mild to moderate erectile dysfunction who took 6 grams of L-arginine daily for three months saw their erectile function scores improve by about 19%, with blood flow to the penis increasing by roughly 24%. Overall, 74% of participants improved by at least one severity category. About 20% of men with mild-to-moderate cases reached blood flow levels consistent with no erectile dysfunction at all. These results were significantly better than placebo, but the dose matters: most positive studies use 5 to 6 grams per day, far more than what’s in a typical supplement capsule.
Korean Red Ginseng
Korean red ginseng contains active compounds called ginsenosides that promote nitric oxide release in penile tissue, essentially nudging the same pathway that Viagra targets. A systematic review pooling data from 151 men across three trials found a statistically significant improvement in sexual function scores compared to placebo. Individual studies consistently showed meaningful score differences. The effect is real but modest. Think of it as a gentle push in the right direction rather than a pharmaceutical-grade solution. Typical study doses range from 1,000 to 3,000 mg daily.
Lifestyle Changes That Improve Erections
Erectile dysfunction is often an early warning sign of cardiovascular problems, which means the same habits that protect your heart also protect your erections. Exercise is the single most effective lifestyle intervention, and the research is specific about how much you need.
A systematic review of intervention studies found that 40 minutes of moderate-to-vigorous aerobic exercise, four times per week, for six months significantly improved erectile function in men whose ED was linked to inactivity, obesity, high blood pressure, or metabolic syndrome. That’s 160 minutes per week of activities like brisk walking, cycling, jogging, or swimming. Mixing in some resistance training and short bursts of higher intensity made the results even better. The key is consistency over months, not a quick fix.
Diet plays a supporting role. Foods rich in dietary nitrates, like beetroot, spinach, and arugula, boost your body’s production of nitric oxide. Beetroot juice, for example, significantly increases nitric oxide metabolites in both men and women regardless of body size. This won’t replace medication, but a nitrate-rich diet supports the same vascular health that makes erections possible. Mediterranean-style eating patterns, heavy on vegetables, fish, olive oil, and whole grains, are consistently associated with lower rates of erectile dysfunction in large population studies.
Topical Treatments
For men who can’t take pills or prefer not to, a topical cream containing alprostadil offers a different approach. Unlike PDE5 inhibitors, alprostadil works directly on penile tissue to widen blood vessels. The cream is applied as drops to the tip of the penis, where it absorbs quickly.
Clinical trials showed efficacy up to 83% in men with severe erectile dysfunction at the higher dose, significantly outperforming placebo. The trade-off is local side effects: about 25% of men experience a burning sensation at the application site, and 11% notice redness. These effects are typically mild and temporary, but they’re common enough to be worth knowing about beforehand.
Penile Injections
Injections directly into the side of the penis sound intimidating, but they remain one of the most effective treatments available, particularly for men who don’t respond to oral medication. The same active ingredient used in topical cream (alprostadil) can be injected in small amounts using a very fine needle. In a study of 155 men already using injection therapy, about 75% also responded to sildenafil, meaning the two approaches have broadly similar success rates. For the remaining 25% who didn’t respond to pills, injections were the treatment that worked. The needle is small, the injection is self-administered after training, and most men report that the discomfort is far less than they expected.
Shockwave Therapy
Low-intensity shockwave therapy is a newer, non-invasive option that uses sound wave pulses applied to the penis to stimulate new blood vessel growth. A meta-analysis found that treated men gained an average of about 3 points on standard erectile function scales compared to controls, a clinically meaningful improvement. An effective short protocol involves four sessions over two weeks, with at least 6,000 pulses per session. Sessions are typically scheduled once or twice weekly. The treatment doesn’t require medication or downtime, and results appear to hold in both short and long-term follow-up. It works best for men with vascular-related erectile dysfunction and is often used alongside other treatments rather than as a standalone solution.
How to Choose What’s Right for You
For most men, a different PDE5 inhibitor is the simplest and most effective place to start. If sildenafil’s timing felt too rigid, tadalafil’s longer window might solve the problem. If side effects were bothersome, avanafil’s more targeted action could mean fewer headaches and less flushing. Generic versions of all these drugs have made cost far less of a barrier than it used to be.
If pills don’t work or aren’t an option, topical treatments and injections offer high success rates through a completely different mechanism. Supplements like L-arginine and Korean red ginseng can complement other treatments but rarely replace them. And for any man dealing with erectile difficulty, 160 minutes of weekly aerobic exercise is one of the few interventions that addresses the root cause rather than the symptom.