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What Is Tadalafil (Cialis)?

What Is Tadalafil (Cialis)?

Tadalafil (Cialis) is a prescription tablet used to treat certain conditions related to blood flow and urinary function in adult men. It belongs to a class of drugs called phosphodiesterase type-5 (PDE5) inhibitors, which work by relaxing blood vessels and improving blood flow in specific parts of the body. This medication should be used only under the supervision of a licensed healthcare provider and requires a valid prescription.

Quick Facts About Tadalafil

Quick Facts About Tadalafil

CategoryInformation
Generic NameTadalafil
Brand NamesCialis
Drug ClassPhosphodiesterase type 5 (PDE5) inhibitor
FDA Approval Year2003 (Cialis)
Indications• Erectile dysfunction (ED)
• Signs and symptoms of BPH (benign prostatic hyperplasia)
• ED + BPH combination
Dosage Forms & StrengthsOral tablets: 2.5 mg, 5 mg, 10 mg, 20 mg
Contraindications• Use with nitrates (risk of severe hypotension)
• Hypersensitivity to Tadalafil
• Concomitant use with guanylate cyclase stimulators (e.g., riociguat)
Warnings & Precautions• Cardiovascular risk with sexual activity
• Hypotension when combined with antihypertensives
• Vision loss (NAION)
• Hearing loss
• Priapism (prolonged erection)
Common Side EffectsHeadache, flushing, nasal congestion, indigestion, back pain, muscle aches
Serious Adverse EffectsSudden vision or hearing loss, priapism, severe hypotension
Drug Interactions• Nitrates (contraindicated)
• Alpha‑blockers (risk of hypotension)
• CYP3A4 inhibitors (ketoconazole, ritonavir) increase Tadalafil levels
Use in Special Populations• Dose adjustment may be needed in mild/moderate impairment
• Not indicated for pediatric use

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What Is the Drug Tadalafil Used For?

What Is the Drug Tadalafil Used For?

According to the FDA prescribing information, Tadalafil (Cialis) is approved to treat:

  • Erectile Dysfunction (ED) in adult men helps improve the ability to achieve and maintain an erection during sexual stimulation.
  • Benign Prostatic Hyperplasia (BPH) is a condition that can cause urinary symptoms like a weak urine stream, difficulty starting urination, or frequent urination.
  • Both ED and BPH together when these conditions occur at the same time.
Tadalafil (Cialis) Mechanism of Action

Tadalafil (Cialis) Mechanism of Action

Tadalafil works by blocking an enzyme called phosphodiesterase type-5 (PDE5). By inhibiting this enzyme, the medication helps relax smooth muscles and widen certain blood vessels in the body.

When PDE5 is blocked:

  • Improved blood flow to the penis: During sexual stimulation, increased blood flow to the penis helps men achieve and maintain an erection when treating ED.
  • Relaxation of prostate and bladder muscles: The medication helps relax smooth muscle in the prostate and bladder, which may improve urinary symptoms associated with BPH.

These effects help relieve symptoms related to erectile dysfunction and urinary problems caused by an enlarged prostate.

Tadalafil Dosage Guide

Tadalafil Dosage Guide

The correct dose of Tadalafil (Cialis) tablets depends on your doctor’s recommendation and on the condition being treated.

Tadalafil Dosage for Erectile Dysfunction (As-Needed Use)

  • Typical starting dose: 10 mg taken before sexual activity
  • Your doctor/healthcare provider may adjust the dose to 5 mg or 20 mg, depending on effectiveness and tolerance
  • Do not take more than one dose per day

Tadalafil Dosage for Erectile Dysfunction (Once-Daily Use)

  • Recommended dose: 2.5 mg once daily
  • Your doctor can increase the dose to 5 mg once daily if needed

Tadalafil Dosage for Benign Prostatic Hyperplasia (BPH)

  • Recommended dose: 5 mg once daily

Tadalafil Dosage for Erectile Dysfunction with BPH

  • Recommended dose: 5 mg once daily
What Are the Side Effects of Tadalafil?

What Are the Side Effects of Tadalafil?

Tadalafil may cause side effects in some people. Many Tadalafil side effects are mild & may improve as your body adjusts to the medication. Contact your provider if side effects are persistent, severe, or interfere with daily activities.

Common Side Effects of TadalafilMild Side Effects of TadalafilRare or Serious Side Effects of Tadalafil
HeadacheIndigestion (upset stomach)Sudden vision loss (NAION – non‑arteritic anterior ischemic optic neuropathy)
Flushing (warmth or redness of face)Back painSudden hearing loss
Nasal congestion (stuffy nose)Muscle achesChest pain (angina, myocardial ischemia risk in susceptible patients)
DizzinessMild nauseaShortness of breath (cardiovascular events)
Limb painFatigueFainting (syncope due to hypotension)
Mild stomach discomfortPriapism (erection lasting longer than 4 hours)

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What Is the Best Time to Take Tadalafil?

What Is the Best Time to Take Tadalafil?

The best time to take Tadalafil depends on how it has been prescribed by your doctor and the condition being treated. This medication may be taken either as needed before sexual activity or once daily, depending on the treatment plan.

If Taken As Needed for Erectile Dysfunction

When used as needed, Tadalafil is usually taken about 30 minutes before sexual activity. The effects of the medication may last up to 36 hours, which is why it is sometimes referred to as the “weekend pill.” It should not be taken more than once per day.

If Taken Once Daily

Some patients are prescribed a low daily dose of Tadalafil. In this case, it should be taken at approximately the same time each day, regardless of sexual activity. This approach allows the medication to maintain a consistent level in the body.

Pharmacist Tips

  • Tadalafil can be taken with or without food.
  • Avoid taking more than the prescribed Tadalafil dose within 24 hours.
  • Follow your doctor’s instructions to ensure the medication works safely and effectively.

Always consult a professional if you are unsure about the correct timing or dosing of this medication.

Tadalafil Precautions

Tadalafil Precautions

  • Tell your provider if you have liver disease, heart disease, kidney problems, or a history of stroke.
  • Inform your doctor or medical professional if you experience vision changes or hearing problems while taking the medication.
  • Avoid excessive alcohol consumption, which may increase the risk of dizziness or low blood pressure.
  • Low blood pressure may occur when Tadalafil is combined with nitrates or certain blood pressure medications.
  • Store the medication at room temperature and keep it out of reach of children.
Who Should Not Take Tadalafil?

Who Should Not Take Tadalafil?

Do not take Tadalafil if you:

  • Are allergic to Tadalafil or any of its ingredients.
  • Take nitrate medications (such as nitroglycerin) for chest pain.
  • Use guanylate cyclase stimulators (such as riociguat) for pulmonary hypertension.
  • Have been advised by a doctor not to engage in sexual activity due to heart problems.
Are There Risks to Taking Tadalafil?

Are There Risks to Taking Tadalafil?

Like all prescription medications, Tadalafil may carry certain risks if not used correctly. Some important safety warnings to consider while taking this medication include:

  • Do not exceed the maximum FDA‑approved dose: 20 mg as needed or 5 mg once daily (depending on indication) for ED.
  • Use caution when combining Tadalafil with alpha‑blockers or antihypertensives, as this may cause low blood pressure.
  • Patients with kidney/liver impairment may require lower doses or special monitoring, and treatment should only be used under medical supervision.
Tadalafil Missed Dose

Tadalafil Missed Dose

If you miss a dose of Tadalafil, what you should do depends on how the medication was prescribed.

  • Once-daily dosing: Take the missed Tadalafil dose as soon as you remember. If it is almost time for your next one, skip the missed dose.
  • As-needed dosing for erectile dysfunction: Simply take the next dose when needed before sexual activity.

Do not take two doses at the same time or take extra medication to make up for a missed dose.

Tadalafil Overdose

Tadalafil Overdose

Taking too much Tadalafil may increase the risk of serious side effects and require medical attention.

Possible Symptoms of Tadalafil Overdose

Symptoms may include:

  • Severe headache
  • Dizziness
  • Low blood pressure
  • Prolonged erection lasting more than 4 hours

If an overdose of Tadalafil is suspected, seek emergency medical care immediately or contact Poison Control for guidance.

Tadalafil Drug Interactions

Tadalafil Drug Interactions

Tadalafil may interact with certain medications that affect blood pressure, metabolism, or blood vessel function. Always inform your provider about all medicines you take.

Drug ClassDrug ExamplesPotential Interaction
NitratesNitroglycerin, isosorbide dinitrate, isosorbide mononitrateCombining with Tadalafil may cause a dangerous drop in blood pressure. This combination is contraindicated and must be avoided.
Alpha‑blockersTamsulosin, doxazosin, terazosinMay cause symptomatic low blood pressure, dizziness, or fainting when used together.
Antihypertensive drugsAmlodipine, lisinopril, losartanMay enhance blood‑pressure‑lowering effects, requiring monitoring.
Strong CYP3A4 inhibitorsKetoconazole, itraconazole, ritonavir, clarithromycinMay increase Tadalafil levels in the blood, raising the risk of side effects. Dose adjustment may be required.
CYP3A4 inducersRifampin, carbamazepine, phenytoinMay reduce Tadalafil's effectiveness by increasing its metabolism.
Other PDE5 inhibitorsSildenafil, vardenafilUsing multiple erectile dysfunction medicines together may raise the risk of adverse effects.
AlcoholBeer, wine, liquorExcess alcohol may increase dizziness, headache, and low blood pressure when combined with Tadalafil.

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What Is an Alternative to Tadalafil?

What Is an Alternative to Tadalafil?

If Tadalafil (Cialis) is not suitable or effective for you, your doctor may recommend other medications:

  • Viagra (sildenafil)
  • Levitra (vardenafil)
  • Stendra (avanafil)
Important Disclaimer

Important Disclaimer

The information provided on this page about Tadalafil (Cialis) is intended for educational and informational purposes only. It should not be used as a substitute for diagnosis, professional medical advice, or treatment. Always consult a qualified provider before starting, stopping, or changing the dosage of any prescription medication. A licensed medical professional can determine whether Tadalafil is appropriate for your medical condition and overall health.

Why Buy Tadalafil from Canada with Polar Bear Meds?

Why Buy Tadalafil from Canada with Polar Bear Meds?

Many U.S. patients find that prescription medications such as Tadalafil can be significantly more expensive at local pharmacies. Ordering from licensed Canadian pharmacy partners through Polar Bear Meds may help eligible patients access the same medication at a more affordable price while maintaining pharmacy safety and regulatory standards.

Why Patients Choose Polar Bear Meds

  • Potential savings of up to 80-90% compared to many U.S. retail pharmacy prices
  • Medications are dispensed through licensed Canadian pharmacy partners
  • Prescription verification by a licensed pharmacist before any order is processed
  • Secure ordering and delivery across the U.S.
  • Dedicated customer support to assist with prescription orders and questions
  • Transparent pricing, so patients can see medication costs clearly before completing an order

Polar Bear Meds requires a valid prescription for all Tadalafil orders, helping support responsible and safe medication use.

Tadalafil Cost & Coupons

Tadalafil Cost & Coupons

The cost of Tadalafil may vary depending on the tablet strength, quantity ordered, and current availability. Patients ordering through Polar Bear Meds may also be able to save even more with:

  • Price-match guarantee if you find a lower price at another licensed Canadian pharmacy.
  • 10% off for first-time customers with code WELCOMEPB10.
  • Earn $20 account credit for every verified referral. Your referral also gets $20 off their first order. After 10 referrals, receive an additional $100 credit.
Tadalafil FAQs

Tadalafil FAQs

Dr. Jackson Miller

Medically Reviewed by Dr. Jackson Miller (M.D)

Dr. Jackson Miller is a board-certified medicine physician & hospitalist. He is a healthcare professional with a strong background in patient care. With years of experience and a patient-first approach, he believes the foundation of good health is a patient who feels informed and empowered. He contributes to medical content review, drawing on his background in clinical practice and patient education. He focuses on presenting health information in a clear, accurate, and accessible way to help readers make informed decisions. His work emphasizes clarity, evidence-based guidance, and understandable explanations of medical topics.

Find Dr. Jackson Miller on:LinkedIn

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