How Sildenafil and Tadalafil Compare in Potency

About half of men ages 40 to 70 have erectile dysfunction (ED) to some degree, although only one in 10 report a complete inability to have erections. Taking an ED drug produces an erection sufficient to start intercourse in about 70% of otherwise healthy men. Does it make any difference which of the four drugs for erectile dysfunction you take?

Side Effects to Keep in Mind

Patients with ED should not just be prescribed sildenafil (Viagra) and then be lost to follow-up. Medicines that you take by mouth are called oral medicines. They're often the first line of treatment for trouble getting or keeping an erection, called erectile dysfunction (ED). Oral medicines for ED usually work well and cause few side effects. The four main medicines taken by mouth for erectile dysfunction are: They enhance the effects of a chemical the body makes that relaxes muscles in the penis, called nitric oxide.

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This boosts blood flow and helps you get an erection from sexual activity. Each oral medicine for ED has a slightly different chemical makeup. These small differences affect the way each medication works, such as how quickly it takes effect and wears off, and the possible side effects. Your doctor or other health care professional can recommend one for you based on these factors, other health conditions you have and any other medicines you take. This medicine works best when you take it on an empty stomach an hour before sex. "Yes, there can be differences," says Dr. Louis Liou, chief of urology at Harvard-affiliated Cambridge Health Alliance in Boston.

Country	Legal Status	Prescription Required	Notable Regulations
United States	Prescription-only	Yes	FDA-approved brands
United Kingdom	Prescription-only	Yes	MHRA regulations
Canada	Prescription-only	Yes	Canadian Health Authority
India	Both OTC and Prescription	Varies	Over-the-counter in some states

"For new patients, I have them try different ones to see what works best." Sildenafil (Viagra) is often the first drug your doctor offers.

Product	Dosage	Quantity + Bonus	Price
Viagra Generic	50mg	180 + 8 Pills	158.82€ 151.26€	Buy
Viagra Generic	150mg	30 + 2 Pills	72.32€ 68.88€	Buy
Viagra Super Active	100mg	10 Pills	28.76€ 27.39€	Buy
Viagra Professional	100mg	60 + 2 Pills	146.74€ 139.75€	Buy
Viagra Oral Jelly	100mg	220 + 18 Sachets	562.28€ 535.50€	Buy
Viagra Original	100mg	12 Pills	72.54€ 69.09€	Buy
Viagra Original	100mg	8 Pills	59.84€ 56.99€	Buy
Viagra Generic	100mg	90 + 6 Pills	129.02€ 122.88€	Buy
Viagra Generic	100mg	10 Pills	28.91€ 27.53€	Buy
Viagra Professional	100mg	20 Pills	71.14€ 67.75€	Buy

It's been on the market longest and its side effects and the medications and foods it interacts with are well known. But the main challenge to finding the best ED drug for you may turn out to be health insurance rules—not biochemistry. It's a common practice among insurers to limit the number of pills you can obtain per month. After you hit your limit, the out-of-pocket cost for a single pill can be very high. "The main obstacle in my practice is the cost," Dr.

Treating ED Without Medications

In the United States, the National Association of Boards of Pharmacy can tell you whether an online pharmacy is licensed and in good standing. If you live in another country, check to see if pharmacy association or regulation agencies offer services like these. Make sure you get the right prescription and dose. When you order medicines and when you receive them in the mail, make sure they're the exact dose and type prescribed by your doctor or other health care professional. The dose is the amount of medicine you take.

Starting Sildenafil: Recommended First-Time Dosage

Don't be fooled into buying "herbal viagra." Never take any medicines that claim to be the "herbal" or nonprescription version of an oral medicine for ED. These aren't an effective option, and some contain harmful substances. Our caring team of Mayo Clinic experts can help you with your health concerns. Visit Mayo Clinic Men's Health to get started. All content on this page has been medically reviewed by: Hassan Thwaini, Clinical Pharmacist and Copywriter, Master of Pharmacy (MPharm) on 30 March, 2026. Liou says. You'll need to work with your doctor to get the pill you need at a price you can afford.

Frequently asked questions

Sildenafil is an effective treatment for erectile dysfunction. It contains the same active ingredient as branded alternatives. Sildenafil works by encouraging more blood to flow to the penis, ensuring a strong erection when you need one. It’s effective for 82% of men.1 Find the clinically proven ED treatment that suits you best. No names, no viagra 100mg logos, no delivery fee.

Substances used in erection medications

4.6* from over 33,000 people like you. BSc (Hons) MBBS MRCGP AFHEA MA (Hons) AFMCP “Efficacy and Safety of Sildenafil Citrate for Treatment of Erectile Dysfunction in a Population With Associated Organic Risk Factors.” Journal of Andrology (2013). “Efficacy and Safety of Sildenafil Citrate for Treatment of Erectile Dysfunction in a Population With Associated Organic Risk Factors.” Journal of Andrology (2013). Answer a few simple questions to get the treatment you need. What are the differences between erectile dysfunction drugs? In addition to Viagra, other ED drugs available in the United States include avanafil (Stendra), tadalafil (Cialis) and vardenafil (Levitra). These all improve blood supply to the penis. In combination with sexual stimulation, the drugs can produce an erection sufficient to initiate and complete intercourse. There is also a fast-dissolving form of Levitra, called Staxyn, that you put under your tongue. One ED drug, Cialis, is FDA-approved for use daily in a dose of 2.5 or 5 milligrams. This helps to produce erections on demand and may also help relieve urinary problems, like difficulty starting urination, that result from an enlarged prostate. The cost to you for ED drug therapy varies considerably, depending on the pharmacy price, prescription co-pays, and your level of health plan coverage.

Other Options for the Treatment of Erectile Dysfunction

Get medical care right away if you take oral ED medicine and have sudden loss of hearing or vision. An erection that doesn't go away on its own. Called priapism, this rare condition can be painful. You need to get treatment for it as soon as possible to help prevent damage to your penis. If you have an erection that lasts more than four hours, call your care team right away.

Choosing the Best Option

Treatments for erectile dysfunction are big business, and online scams abound. If you do buy medicines over the internet: Check to see if an online pharmacy is legitimate. Never order medicines from an online pharmacy that doesn't list its phone number and physical address, has prices that seem too good to be true, or tells you that no prescription is needed. Also stay away from ones that don't have a licensed pharmacist on staff to answer your questions. Some illegal businesses sell fake versions of real medicines, which can be dangerous or might not work. Even if private insurance covers it, you may be limited to four doses per month.

• The term "strongest Viagra" refers mainly to the highest approved dose.
• Placebo effects can sometimes influence perceived strength of Viagra.
• The strongest Viagra may work better on an empty stomach.
• Generic Viagra offers similar strength at a lower cost.
• Always check for authenticity when buying the strongest Viagra.
• The strongest Viagra should be taken as prescribed, not exceeding dose.
• Enhancing Viagra with proper sexual stimulation improves results.
• Some formulations include extended-release features for longer effects.
• The strongest Viagra doses are typically administered under medical supervision.
• Combining Viagra with certain substances can dangerously amplify strength.

Here are a few things you can do to contain costs: Various web-based tools can help you compare prices easily.

Side Effects and Drug Interactions

You can take it in a small dose daily or in a larger dose as needed. You can take this medicine with or without food 30 minutes before sex, depending on the dose. It lasts 4 to 5 hours, or longer if you have mild to moderate ED. These medicines all work well for ED. When choosing one, tell your doctor or other health care professional what your preferences are, such as cost, ease of use, how long the drug's effects last and side effects.

Typical dosages

Generic versions of sildenafil, vardenafil and tadalafil are available. Check with your health care team before you take any medicine for erectile dysfunction. Oral ED medicines might not work or might be dangerous if you also take any of the following: Often, these are prescribed for chest pain called angina. Some examples of nitrates are nitroglycerin (Nitro-Dur, Nitrostat, others), isosorbide mononitrate (Monoket) and isosorbide dinitrate (Bidil). These are commonly prescribed for an enlarged prostate or male pattern baldness. Ask your doctor about pill splitting, where you get the pills at a higher dose than you need and divide them. These allow you to obtain a limited supply of medications not covered by your insurance. ED drugs produce an erection sufficient for intercourse in about 70% of men. But the results vary quite a bit from one individual to another.

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They include dutasteride (Avodart, Jalyn) and finasteride (Propecia, Proscar). Medicines that block an enzyme called CYP3A4. Oral medicine for ED also might not be safe or work well if you have: Very low blood pressure, called hypotension, or uncontrolled high blood pressure, called hypertension. Kidney disease viagra sildenafil price that needs to be treated with dialysis. These include a heart attack, stroke or a serious heart rhythm disorder in the past six months.

If you take more than the recommended amount of Viagra

An inherited eye disease that affects the retina. Side effects of oral ED medicines are often mild. Visual changes, such as blue tinge to vision, sensitivity to light or blurred sight. Rarely, more-serious side effects can happen, including: Some people have suddenly lost some of their hearing or vision after taking one of these medicines. But it isn't clear whether these side effects were caused by the medicine or by health conditions that the people already had. A man with nerves or arteries damaged by prostate surgery, diabetes, or cardiovascular disease will not respond as strongly to ED drugs. "There are some men in whom none of these drugs work," Dr. Liou says. How soon the drugs start working ranges from 15 to 60 minutes. Neither Viagra nor Levitra will work if you take them after a meal, which blocks their absorption. However, neither Cialis nor Stendra interact with food this way.

• The potency of Viagra depends on the dosage and individual response.
• The "strongest" Viagra often refers to 100mg doses for maximum effect.
• Combining Viagra with certain medications can amplify strength and risks.
• Some counterfeit Viagra pills may claim to be stronger, but are unsafe.
• Over-the-counter Viagra alternatives are generally less potent and less regulated.
• Prescription guidelines prioritize safety over maximum strength.
• Gradually increasing Viagra dose can lead to the strongest effect.
• The strongest Viagra pills may enhance erectile response significantly.
• Higher doses are generally taken 30-60 minutes before intimacy.
• Lifestyle factors can affect the potency of even the strongest Viagra.

The onset time determines how soon you can engage in intercourse. Stendra and daily-use Cialis are closest to being an "on demand" erectile drug; using the others requires more planning. Dr.

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The body takes longer to absorb it after a high-fat meal or alcohol. Its effects often last for 4 to 5 hours. It might work longer if you have mild to moderate erectile dysfunction. This medicine also works best when you take it an hour before sex on an empty stomach. As with sildenafil, a high-fat meal or alcohol keep the body from absorbing it as quickly.

Comparing Sildenafil vs. Tadalafil Dosage

Vardenafil usually works for 4 to 5 hours. Its effects might last longer if you have mild to moderate ED. A newer form of the medicine that dissolves on the tongue might work faster than the pill that you swallow. This medication is taken with or without food an hour before sex. It works for up to 36 hours. Liou says that some men come to him after getting a prescription from their primary care doctors, claiming that the drug doesn't work.

Strategy	Dosage (mg)	Timing Before Activity	Additional Tips
Standard Dose	50-100	30-60 minutes	Take on an empty stomach for quicker onset
High-Strength Dose	150-200	15-30 minutes	Use only if prescribed and tolerated
Split Dosing	50 + 50	30 minutes apart	May prolong effectiveness
Taking With Food	50-100	60-120 minutes	Food delays absorption, adjust timing

Sometimes it's because they used it incorrectly. "The biggest misconception is that these drugs are an on/off switch for erections," Dr. Liou says. But the drugs don't work well without sexual stimulation.

Brand / Generic	Manufacturer	Strength	Price Range	Availability
Viagra (Generic)	Pfizer	100-200 mg	$2-$5 per pill	Global
Kamagra Solo	Ajanta Pharma	100 mg	$1-$3 per pill	Online markets, some countries
Sildenafil Eurosil	Eurosil Azor	150 mg	$3-$6 per pill	Europe
Revatio	Pfizer (for pulmonary hypertension)	20 mg	Higher cost	Prescription only

"During that time, you need to be with your partner and have foreplay," Dr.

• Personalized medicine can determine the strongest safe Viagra dose.
• The strength of Viagra is often tested in clinical trials.
• Risk factors for using the strongest Viagra include heart issues.
• The strongest Viagra pills are often 100mg, correctly prescribed.
• Off-label higher doses are not recommended without doctor approval.
• The strongest Viagra might require a prescription in many countries.
• Proper hydration can enhance the effects of the strongest Viagra.
• The potency of Viagra can diminish with age or health conditions.
• Some users find the second strongest dose gives optimal results.
• Always consider side effects before choosing the strongest Viagra dose.