We include products we think are useful for our readers. If you buy through links on this page, we may earn a small commission. Here’s our process.

Healthline only shows you brands and products that we stand behind.

Our team thoroughly researches and evaluates the recommendations we make on our site. To establish that the product manufacturers addressed safety and efficacy standards, we:
  • Evaluate ingredients and composition: Do they have the potential to cause harm?
  • Fact-check all health claims: Do they align with the current body of scientific evidence?
  • Assess the brand: Does it operate with integrity and adhere to industry best practices?
We do the research so you can find trusted products for your health and wellness.
Was this helpful?

Cialis is a medication approved by the FDA to treat erectile dysfunction (ED) and benign prostatic hyperplasia (BPH) in those assigned male at birth.

A hand holding up a package of Cialis medication in a pharmacy setting.Share on Pinterest
Fred De Noyelle /GODONG/Getty Images

Cialis is the brand name for tadalafil, a medication used to treat ED. It’s in a class of drugs called phosphodiesterase-5 (PDE5) inhibitors.

Cialis and generic Cialis (tadalafil) are taken as an oral tablet, either as a low dose daily medication or as a higher dose “on-demand” medication.

Both the branded and generic tablets have the same primary ingredient, though the overall chemical make-ups are a little different. Still, both are equally effective. The main difference is the price.

Pros

  • lasts up to 36 hours for some people, which is longer than Viagra
  • can be taken as needed or on a daily, regular basis
  • daily use allows for a more spontaneous sex life
  • can be taken with or without food
  • helps maintain erections longer
  • some users say their orgasms are more intense

Cons

  • can cause headaches and muscle aches
  • must be swallowed whole
  • can cause indigestion
  • can make you appear flushed
  • not available over-the-counter (OTC)
Was this helpful?

Cialis works by increasing blood flow to the penis to help a person get and maintain an erection.

To do this, it blocks the PDE5 enzyme, which enhances the effects of nitric oxide (NO). Nitric oxide activates a series of chemical reactions that increase blood flow to the penis by relaxing blood vessels.

Cialis also relaxes the smooth muscle in the prostate and the bladder.

However, Cialis doesn’t increase libido. Physical and psychological arousal is still necessary for the medication to help achieve and sustain an erection.

It also doesn’t protect against sexually transmitted infections (STIs).

Cialis can be used to treat:

  • ED: Cialis is primarily used to treat ED. Both the American Urological Association and the European Association of Urology Guidelines recommend considering a PDE5 inhibitor as the first-line treatment for ED as long as it doesn’t interfere with your other medications or cause you to have any severe side effects.
  • Benign prostatic hyperplasia (BPH): Cialis and tadalafil are also prescribed to treat the symptoms of BPH, also known as an enlarged prostate.
  • Pulmonary arterial hypertension (PAH): Tadalafil is also FDA-approved to treat pulmonary arterial hypertension, which is high blood pressure affecting the arteries in the lungs. The typical dose for PAH is two 20-milligram tablets (40 mg) taken daily. Adcirca is the brand name for tadalafil that’s used to treat PAH.

Obtaining Cialis

Cialis and generic tadalafil are available with a prescription only. There is no OTC version, though there have been efforts in recent years to develop a nonprescription version of tadalafil.

Cialis is available as an oral tablet in several dosages. You have a couple of different options for when to take the pill:

  • Daily: You can take a daily, low dose pill in a 2.5- or 5-mg tablet. Doctors usually start their patients on the 2.5-mg dose. The 5 mg dose may be appropriate if needed for greater effectiveness, though it may lead to undesirable side effects for some people.
  • On-demand: If you prefer, you can take a stronger dose as needed before sexual activity. In this case, doctors usually recommend starting with a 10-mg dose and moving up to 20 mg if a stronger dose is needed to achieve the desired results.

A 2016 study found that while low dose daily use may have produced a slightly weaker effect than the higher dose, on-demand use in some study participants, there did not appear to be a major benefit with one approach over the other.

To get the most out of Cialis:

  • Time your dose appropriately: With an on-demand dose, take Cialis at least 30 minutes prior to sexual activity. Just understand that it could take up to 2 hours to take effect. With a daily dose, take it at about the same time every day.
  • Focus on managing stress: Stress can be a contributing factor to ED. It can also affect how well Cialis works.
  • Focus on overall wellness: Eating a nutritious diet, being physically active, abstaining from smoking, and moderating alcohol consumption can all make a difference.

In clinical trials, some of the most common side effects associated with Cialis were:

Cialis is more likely to cause myalgia (muscle pain) when compared with other PDE5 inhibitors, according to 2016 research.

But many people who take Cialis or generic tadalafil do not experience side effects. Those who do often have minor effects that tend to go away once the drug is out of their system.

Muscle aches may last up to 2 days or so after taking your last dose.

More potential and serious symptoms include priapism, an abnormal, sometimes painful erection that lasts more than 4 hours.

If you have any sudden changes in vision or hearing, which occasionally occur with tinnitus and dizziness, reach out to a healthcare professional immediately.

The price of brand-name Cialis will vary based on:

  • the dosage
  • the pharmacy or online service you choose
  • any shipping and handling charges that may be included

In general, a lower dose (2.5 mg and 5 mg) that’s meant for daily use can cost around $15–$17 per dose, and a higher dose (10 mg and 20 mg) meant for “as-needed” use can cost around $60 per dose. But discounts may be available when buying in bulk or through any website promotional offers.

It’s also worth considering generic Cialis (tadalafil) if brand-name Cialis is outside of your budget. Tadalafil has the same active ingredients as Cialis but is sold at a significantly lower price.

If you don’t want to or can’t visit your doctor in person, you may be able to get a prescription for Cialis online. There are a few telehealth services that offer easy and discreet options.

Brand-name CialisGeneric Cialis (tadalafil)Daily generic Cialis (tadalafil)
Hims$958 per month (5 mg)starting at $82 per month (5 mg, 10 mg, 20 mg)starting at $82 per month (2.5 mg, 5 mg)
Roman$20–$80 per dose (5 mg, 10 mg, 20 mg)$11–$44 per dose (5 mg, 10 mg, 20 mg)$8 per dose (2.5 mg, 5 mg)
LemonaidN/A$8 per dose (5 mg, 10 mg, 20 mg)$8 per dose (5 mg)
REX MD$29 per dose (10 mg, 20 mg)$6 per dose (10 mg, 20 mg)$2 per dose (2.5 mg, 5 mg)

Unlike some other PDE5 inhibitors, Cialis may be taken with or without food. Food is unlikely to have any impact on its effectiveness or side effects.

Still, there are a few other things to keep in mind when taking the medication.

Avoid grapefruit juice

Grapefruit and grapefruit juice can enhance levels of Cialis in the bloodstream, potentially increasing negative side effects.

Avoid heavy alcohol drinking

Moderate alcohol consumption should have little effect on how Cialis works. But heavy alcohol consumption can make it difficult to achieve an erection — even with an ED medication.

Know your other medications

Cialis may interact with certain medications. In particular, you should not take Cialis if you’re also taking nitrates, which are medications that widen arteries to allow greater blood flow.

Nitrates are typically prescribed to treat angina (chest pain brought on by narrowed coronary arteries) or heart failure.

When taken with nitrates or antihypertensive medications called alpha-blockers, Cialis could cause a dangerous drop in blood pressure.

Cialis may lead to similar problems when used in combination with other antihypertensive drugs.

Other classes of drugs that may interfere with Cialis include:

You should also avoid taking two PDE5 inhibitors in 1 day, as this can lead to a dangerous drop in blood pressure and other serious side effects.

Is generic Cialis or tadalafil as effective as Cialis?

Cialis and tadalafil are equally effective. The FDA works to ensure that the generic versions of all brand-name medications provide the same clinical benefits.

The main difference between Cialis and tadalafil is the cost.

Though prices vary considerably depending on the manufacturer and pharmacy where you’re buying the medication from, Cialis typically costs around $365–$1,735 for 30 tablets. The generic versions cost about $12–$25 for 30 tablets.

Was this helpful?

While Cialis is widely prescribed around the world, the most well-known PDE5 inhibitor is Viagra (sildenafil), which was the first medication in this class of drugs to hit the market.

In addition to Cialis and Viagra, the other PDE5 inhibitors include:

These medications work best when used in combination with doing other things to support your overall health, especially those that directly impact your cardiovascular health.

In addition to PDE5 inhibitors, there are alternatives to medications some people consider, along with healthy habits. Among them are supplements and pill-free options, like:

  • L-arginine, an amino acid that helps manufacture nitric oxide
  • red ginseng, also known as Panax ginseng, an herb that’s sometimes taken to lower inflammation
  • acupuncture, though research has shown conflicting results

Read more about ED and supplements.

Other habits that help sexual function

Making certain lifestyle changes may help with ED, too. This includes:

  • getting regular exercise when possible
  • quitting smoking (if you smoke)
  • getting 7–8 hours of sleep each night
  • consuming nutrient-dense foods when possible
  • finding ways to manage stress
Was this helpful?

Cialis and Viagra each have their pros and cons, though the medications work similarly in the body.

Cialis has the advantage of lasting longer, with effects often lingering up to 36 hours after taking the tablet.

Viagra usually lasts about 4 hours. Viagra is also an on-demand medication only, so the spontaneity that daily Cialis use allows is not an option with Viagra.

But Cialis is associated with muscle aches in the limbs in some users, a side effect not associated with Viagra. However, research from 2021 suggests that Viagra use may be associated with vision problems.

You can also find generic versions of both Cialis and Viagra.

Your lifestyle and personal experience with a particular medication may help you determine if Cialis, Viagra, or another PDE5 inhibitor is the right choice.

Taking Cialis daily will make it easier for you to get and keep an erection for as long as you regularly take the medication. If you’re only taking a higher dose of Cialis as needed, the ability to get an erection could last up to 36 hours for some people.

Side effects of Cialis can include headaches, muscle aches, congestion, and indigestion.

No, while this is often a misunderstanding of the effects of Cialis, this medication doesn’t cause an erection all on its own or cause you to have an erection long past the point of orgasm.

People with ED symptoms are frequently unable to have a full erection when sexually aroused. Taking Cialis helps inhibit the PDE5 enzymes that may be preventing the erection. It’s very unlikely that you will have an erection if you are taking Cialis and are not sexually aroused.

Cialis also won’t extend your erection past the point of orgasm or beyond when your erection would typically end following a sexual encounter.

If using Cialis causes you to maintain an erection for more than 4 hours, it can result in a serious condition called priapism. This can cause long-term damage if not treated immediately by a doctor.

Since Cialis doesn’t keep you erect any longer than the amount of time you commonly experience an erection, it’s difficult to estimate the amount of time that you can expect to stay erect.

Cialis doesn’t extend how long you can stay erect but inhibits the PDE5 enzymes that could prevent or limit you from having a full erection.

If you’re not experiencing ED symptoms, taking Cialis wouldn’t extend the amount of time that you stay erect or cause any noticeable changes to your sexual performance.

When it comes to ED medications like Viagra and Cialis, don’t think of them as sexual performance enhancers — think of them as treatment that helps some people with ED to have a full erection when sexually aroused.

Yes, Cialis in higher dosages can last up to 36 hours, while Viagra commonly lasts up to 4 hours. Talk with your doctor to see which medication best fits your sexual lifestyle.

Cialis, the brand-name version of the PDE5 inhibitor tadalafil, is one of the world’s most widely prescribed ED medications.

Generic tadalafil has been available since 2018 and has proven to be just as effective and safe as the brand name.

The drug is available in low daily doses that keep the medication in your system and allow for greater spontaneity. It’s also available in stronger, on-demand doses.

While Cialis and other ED drugs don’t “cure” the condition, they can treat the primary symptom by helping you achieve and maintain erections.

Cialis is available by prescription only, so reach out to a doctor about this and other possible ED treatments.