How many mg of Cialis is equal to Viagra?

There is no direct milligram-to-milligram conversion between Cialis (tadalafil) and Viagra (sildenafil) because they are different medications with different chemical compositions and durations of action.

Is 10 mg of Cialis equal to 50 mg of Viagra?

Summary: Cialis® (tadalafil) and Viagra® (sildenafil) both block PDE5—but have different chemical compositions, durations, and side effects. Cialis® usually comes in dosages of 5 mg, 10 mg, or 20 mg. Viagra® typically comes in dosages of 25 mg, 50 mg, or 100 mg.

Is 20mg Cialis equivalent to 100mg Viagra?

No, 20mg Cialis is not equal to 100mg Viagra.

If you took 20mg of Cialis instead of 100mg of Viagra, you might notice a longer duration of action but a slower onset. Viagra tends to work faster, usually within 30 to 60 minutes, whereas Cialis can take up to two hours.

Is 10mg of tadalafil stronger than 10mg of sildenafil?

Tadalafil works a little faster than sildenafil, and lasts longer. This doesn't mean it's a stronger drug – it just works differently. Sildenafil takes effect in about an hour, where tadalafil usually starts working in half an hour.

Why does the doctor say "don't take Viagra with Cialis"?

Last updated on Nov 14, 2025. Cialis (tadalafil) and Viagra (sildenafil) are both prescription drugs used to treat erectile dysfunction (ED), but taking them together is generally not recommended. Mixing these medications can lead to dangerously low blood pressure and a higher risk of side effects.

Viagra and Cialis Dosage Guide—A Urologist Explains the Erectile Dysfunction Medications

How much tadalafil is equal to 100mg of sildenafil?

Is 20 mg Tadalafil equal to 100mg Viagra? No, 20mg of Tadalafil is not the same as 100mg of Sildenafil (Viagra). While both medications treat erectile dysfunction (ED) by increasing blood flow to the penis, they work differently in terms of onset, duration, and effectiveness.

Can I take Cialis 20 mg two days in a row?

Dose for erectile dysfunction

Do not take more than 1 tablet a day. Your doctor may increase or decrease your dose, depending on how well it works and how often you take it. The effects may last longer than 24 hours, so you're not recommended to take the 10mg or 20mg tablets every day.

What should I avoid while taking Cialis?

You should never take Cialis (tadalafil) with nitrates (like nitroglycerin for chest pain) due to risk of dangerously low blood pressure, and avoid grapefruit/juice, alcohol, other ED drugs, certain antibiotics (macrolides), antifungals (azoles), HIV meds (protease inhibitors), alpha-blockers (for prostate/BP), seizure meds, and blood pressure drugs, as these can all cause serious side effects like severe BP drops or increased risks; always tell your doctor about all medications and supplements.
 

How to make Cialis work better?

It is important to take the medication well in advance of sexual intercourse to make sure the medication is absorbed. Typically, Cialis can be taken 1-3 hours prior to intercourse if used on an as-needed basis.

What is 10 times stronger than Viagra?

Structurally vardenafil (Levitra) is similar to sildenafil, while tadalafil (Cialis) is very different. Vardenafil (Levitra) is almost 10 times more biochemically potent than sildenafil, therefore a lower dose is needed to facilitate the penile erection, potentially resulting in less side effects.

Why is Cialis so much better than Viagra?

Cialis and Viagra are both PDE5 inhibitors used for the treatment of erectile dysfunction (ED). Both only work when a man is sexually aroused. Cialis lasts for around 36 hours compared with only 4 to 5 hours for Viagra. Food does not affect the activity of Cialis, whereas food may decrease the effectiveness of Viagra.

What is the downside to Cialis?

CIALIS can cause your blood pressure to drop suddenly to an unsafe level if it is taken with any nitrate medication. You could get dizzy, faint or have a heart attack or stroke. Tell your healthcare provider that you take Cialis.

What kicks in faster, Viagra or Cialis?

Sildenafil / Viagra has its onset quicker, usually within 30 minutes to an hour, and lasts for several hours. Tadalafil / Cialis has a slower onset of action, 1-2 hours, but lasts longer in the system, up to 36 hours.

How much is Cialis at Walmart?

At Walmart, the cost for Cialis (brand) is very high, around $1,280 for a month's supply, but the generic version, Tadalafil, is much cheaper, with prices varying greatly by dosage and coupons, potentially ranging from under $20 to around $50 for 30 tablets with savings cards like GoodRx and SingleCare, making it the most affordable option. 

What happens if a woman takes Cialis?

Cialis causes vasodilation that ultimately increases pelvic blood flow in both men… this impact helps facilitate better erections. In women, that same increased blood flow can improve sexual arousal, lubrication, and perhaps even help facilitate stronger orgasms.

Can you switch back and forth between Viagra and Cialis?

Both have similar effectiveness and function in the body and are regarded as generally safe when taken as directed. You may be able to alternate between Cialis and Viagra. Still, you shouldn't take them simultaneously, nor should you take Cialis in the morning and Viagra at night.

What fruits not to eat with Cialis?

Studies have also suggested that when considering food and Cialis, it is best to avoid eating grapefruit or drinking grapefruit juice while using this Cialis unless your doctor or pharmacist says you may do so safely. Grapefruit may increase the chance of side effects with this medicine.

Is it better to take Cialis every day instead of occasional?

If you're treating ED, you may have the option to take Cialis as needed or daily. But if you're treating BPH (with or without ED), it's better to take it every day. Daily Cialis isn't recommended if you have severe kidney disease or are receiving dialysis.

Are two 5mg Cialis the same as one 10mg?

Cialis tablets come in four FDA-approved doses: 2.5mg, 5mg, 10mg, and 20mg (milligrams). If you're prescribed 5mg Cialis and wondering, Can I take two 5mg Cialis at once? to bump yourself up to the 10mg dose, don't do it.

Can you overdose on 20 mg of tadalafil?

It is possible to overdose on tadalafil and experience toxic side effects. Symptoms may include any of the above adverse effects or: Collapsing or fainting. Trouble breathing.

What is the peak hour of tadalafil?

Most men feel the benefit of tadalafil after 30 minutes. 52% of patients can have successful sexual intercourse within 30 minutes of taking tadalafil. After 2 hours, the maximum concentration of the drug is in the bloodstream.

Which generic Cialis is best?

There isn't one "best" generic Cialis (tadalafil), as all legitimate generics contain the same active ingredient and are equally effective as brand-name Cialis; the best choice depends on cost and provider, with options like Hims, Roman, or your local pharmacy offering similar products, but ensure you're getting FDA-approved tadalafil from a reputable source for safety and efficacy, as appearance (color/shape) varies but function doesn't. 

Is there a pill that combines Viagra and Cialis?

Ro Sparks combines the active ingredients of Cialis and Viagra into one fast-acting sublingual medication. Talk to a healthcare provider about your treatment options, especially if you have health conditions like heart disease, diabetes, or performance anxiety that could be affecting your sexual performance.