Cialis vs. Viagra: Which ED medication is right for you?

In this article:

• What is Cialis?
• What is Viagra?
• Key differences between Cialis and Viagra
• Conditions treated
• Which is better, Viagra or Cialis?
• Coverage and cost comparison
• Side effects comparison
• Interactions and warnings

In this article

• What is Cialis?
• What is Viagra?
• Key differences between Cialis and Viagra
• Conditions treated
• Which is better, Viagra or Cialis?
• Coverage and cost comparison
• Side effects comparison
• Interactions and warnings

If erectile dysfunction (ED) is putting a damper on your sex life, your healthcare provider might prescribe Viagra (sildenafil) or Cialis (tadalafil). Both of these ED medications belong to a class of drugs called phosphodiesterase type 5 enzyme (PDE-5) inhibitors, which promote blood flow to the penis. 

Below, we unpack the similarities and differences between Cialis versus Viagra, two of the most popular ED medications.

What is Cialis?

Cialis is a brand-name prescription medication that is approved by the Food and Drug Administration (FDA) to treat ED and benign prostatic hyperplasia (BPH), also known as enlarged prostate. It is sometimes used off-label to treat lower urinary tract symptoms (LUTS) related to BPH, Raynaud’s phenomenon, and to prevent High-Altitude Pulmonary Edema (HAPE).

The active ingredient in Cialis is a PDE5 inhibitor called tadalafil. Cialis lasts up to 36 hours, so it can be prescribed as a daily dose or on demand. The longer duration of action is the biggest difference between Cialis and Viagra, according to Anthea Nwandu, MD, FACP, a board-certified internist and lifestyle medicine physician in Baltimore, Maryland. She explains: “For men who feel anxious about performance, or who want intimacy to feel more spontaneous, Cialis often leads to a more natural experience.”

What is Viagra?

Viagra is a brand-name prescription medication that is FDA approved to treat ED. Off-label prescriptions for Viagra are not common, but it is occasionally used off-label for secondary Raynaud phenomenon, female sexual arousal disorder, and as an adjunct therapy for altitude-induced hypoxemia. 

Viagra’s active ingredient, sildenafil, is a PDE5 inhibitor that widens blood vessels in the penis to improve erectile function. Viagra is taken on demand, anywhere from 30 minutes to four hours before sexual activity. It works quickly but tapers off after four hours. Dr. Nwandu says this makes Viagra an excellent option for men who want an ED medication with a shorter duration that can be taken “only when needed.”

Both Cialis and Viagra are approved to treat ED. But as mentioned above, Cialis is also approved to treat an enlarged prostate. Both medications also have a few off-label uses.

Which is better, Viagra or Cialis?

Both Viagra and Cialis are first-line treatments for ED. People taking these medications still require sexual stimulation, as the drugs do not trigger spontaneous erections. Cialis and Viagra are not treatment options for low libido or premature ejaculation. Which is better for you may depend on your lifestyle and preferences, as well as your individual tolerance to the medication.

A systematic review and meta-analysis comparing Viagra and Cialis found that both drugs had similar rates of effectiveness and adverse events. However, individuals on Cialis experienced more improvements in sexual confidence compared to individuals on Viagra. “When patients tell me they feel more confident on Cialis compared to Viagra, it usually comes down to psychological freedom,” Dr. Nwandu says. “Viagra’s shorter effect can make men feel rushed. Cialis removes that ticking clock.”

Of course, Viagra is better for spontaneity because it kicks in more quickly than Cialis. Most men can feel the benefits less than 30 minutes after they take Viagra. By contrast, studies show that the effects of Cialis peak about two hours after taking it.

Ultimately, the best medication for a patient should be determined only by a healthcare provider familiar with the person’s medical condition, history, and any medications they may already be taking that could interact with Cialis or Viagra, as well as the patient’s response to treatment.

“If my patient asked me, ‘Doc, which one should I start with?” I’d say, ‘Let’s try Viagra first. It’s short-acting, so you’ll get a feel for how your body responds. If you like the effect but want more flexibility, we can switch to Cialis later.’” – Anthea Nwandu, MD

Cialis vs. Viagra: Insurance coverage and cost comparison

Both Cialis and Viagra are brand-name drugs that are available in generic form. The generic form of Cialis is tadalafil, while the generic form of Viagra is sildenafil. 

“ED medications are very rarely covered by insurance, regardless of which one is prescribed,” says Blair Gingerich, Pharm.D., an ambulatory care pharmacist in northern Indiana. However, some plans may cover generic ED medications when an underlying health condition causes erectile dysfunction, or when the medication is taken for a different condition, such as BPH or an enlarged prostate. 

Without insurance, the retail costs for Cialis and Viagra can vary by pharmacy and location. The average retail price of Cialis is $437 for 30, 5 mg tablets, whereas the average Viagra cost is about $1,064 for 10, 100 mg tablets. The good news is that you can save on prescription drugs by using SingleCare coupons or your free SingleCare prescription discount card. 

Prescription drug prices often change. These are the most accurate medication prices at the time of publishing in ZIP code 23666 as of Feb. 13, 2026. The listed price without insurance references the price of brand-name drugs (unless otherwise specified). The listed SingleCare price references the price of generic drugs if available.

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Cialis vs. Viagra side effects

Cialis and Viagra are both PDE5 inhibitors, so they cause similar side effects. “The most common side effects have to do with the vasodilation properties associated with PDE5 inhibitors,” Dr. Gingerich says. “People taking these medications may experience flushing, headaches, or indigestion.”

Common side effects of both Viagra and Cialis include:

• Skin flushing
• Vision changes
• Nasal congestion
• Back pain or muscle aches

Serious side effects of Cialis and Viagra include:

• Vision loss
• Hearing changes
• Seizure
• Chest pain
• Priapism (a prolonged erection)

Consult your healthcare provider for a complete list of side effects.

Cialis and Viagra drug interactions and warnings

PDE5 inhibitors aren’t right for everyone. That’s why it’s essential to disclose your full medical history and medications list (prescription and over-the-counter drugs and supplements) to your healthcare provider before starting Cialis or Viagra.

Specifically, Cialis and Viagra may not be safe in some people with cardiovascular conditions since the medications affect circulation. Seek medical advice about using PDE5 inhibitors if you have high blood pressure or have had a heart attack or angina. Tadalafil and sildenafil should not be mixed with nitrates, alpha blockers, or hypertension drugs. Cialis and Viagra should also not be taken by people who are pregnant or breastfeeding. Tell your healthcare provider if you have low blood pressure or heart disease.

Bottom line

Cialis and Viagra are both safe, effective ED medications. Choosing which is best, or whether an alternative might be better or safer, is a decision that should be made with a healthcare provider familiar with your health history, lifestyle, and other conditions you may have. 

The SingleCare prices in this article are the most accurate at the time of publishing in ZIP code 23666 as of Feb. 13, 2026. Prices vary by pharmacy. Visit our coupon pages for updated Cialis and Viagra prices near you.