Tadalafil Side Effects: Common, Serious, and Long-Term Effects

Tadalafil (Cialis) can cause side effects such as headache, indigestion, back pain, muscle aches, flushing, and nasal congestion. Official Cialis prescribing information lists these among the drug’s known adverse reactions. Most are mild or temporary, but tadalafil can also cause uncommon or rare problems that need urgent medical attention, including a prolonged erection, sudden vision or hearing changes, and dangerously low blood pressure when combined with nitrates.

For people who take tadalafil every day or use it over a long period, available long-term safety data have not identified a new pattern of adverse effects beyond the established safety profile. However, long-term treatment is not appropriate for everyone, and individual risk depends on dose, other medications, cardiovascular health, and kidney or liver function.

Common Tadalafil Side Effects

The most frequently reported tadalafil side effects are similar whether the medicine is used as needed or as a once-daily treatment. Reviews such as StatPearls on tadalafil and the NHS tadalafil safety guidance describe commonly reported effects including:

• • Headache

• • Indigestion or heartburn

• • Back pain

• • Muscle aches

• • Flushing

• • Nasal congestion

• • Dizziness in some users

These effects are usually mild to moderate and often improve as the drug wears off or as the body adjusts. If a side effect is persistent, severe, or difficult to tolerate, contact the clinician who prescribed tadalafil rather than changing the dose on your own.

Serious Tadalafil Side Effects: When To Get Medical Help

Serious reactions are uncommon, but some symptoms require prompt or emergency medical attention. The Cialis prescribing information includes warnings about priapism, sudden vision loss, sudden hearing decrease or loss, and clinically important hypotension in certain situations.

• An erection lasting more than four hours (priapism)

• Sudden loss or marked decrease in vision

• Sudden decrease or loss of hearing, with or without ringing in the ears or dizziness

• Chest pain, fainting, or symptoms of severe low blood pressure

• Signs of a severe allergic reaction, such as facial or throat swelling or difficulty breathing

If chest pain occurs after taking tadalafil, seek urgent medical care and tell the medical team when you last took the drug. Nitrate medicines such as nitroglycerin can interact with tadalafil and cause a dangerous fall in blood pressure; this combination is contraindicated in the official label.

Can You Take Tadalafil Daily?

Yes. Tadalafil is approved in once-daily dosing regimens for certain indications, including erectile dysfunction and symptoms of benign prostatic hyperplasia. The official prescribing information includes once-daily dosing options, while clinical trials such as a study of tadalafil 5 mg once daily for LUTS/BPH have evaluated longer-term use.

Daily use does not mean tadalafil is risk-free. A prescriber should review your other medicines, cardiovascular status, and relevant kidney or liver problems before deciding whether daily treatment is appropriate.

Tadalafil Side Effects With Long-Term Use

Long-term studies of tadalafil have followed people for roughly one to two years. In a large long-term safety and tolerability study, researchers did not identify a new pattern of adverse effects with prolonged exposure. Another longer-term once-daily study also reported sustained tolerability in its study population.

These findings are reassuring, but they do not prove that every person can take tadalafil indefinitely without risk. Long-term safety depends on individual health, other medications, dose, and whether new contraindications or medical conditions develop over time.

Does Long-Term Tadalafil Damage the Liver or Kidneys?

Available long-term trial data have not shown a consistent signal of tadalafil causing liver or kidney damage in otherwise eligible participants. However, the liver helps metabolize tadalafil and the kidneys contribute to its clearance, so impaired liver or kidney function can change how the drug is used. The prescribing information provides specific dosing restrictions and cautions for renal and hepatic impairment.

People with kidney or liver disease may need a lower dose, a different dosing schedule, or avoidance of tadalafil depending on the severity of impairment. Monitoring should be individualized by the prescribing clinician rather than based on a universal testing schedule.

Does Tadalafil Affect the Heart?

Tadalafil widens blood vessels and can modestly lower blood pressure. For many people this effect is small, but cardiovascular safety depends heavily on other medications and underlying heart disease. The Princeton IV consensus recommendations discuss cardiovascular assessment and PDE5 inhibitor use in people with erectile dysfunction.

The most important interaction is with nitrates. Tadalafil should not be used with nitrate medicines because the combination can cause severe hypotension. The drug is also contraindicated with guanylate cyclase stimulators such as riociguat, according to the FDA label. Extra caution may be needed with some alpha-blockers, blood-pressure medicines, or in people whose cardiovascular condition makes sexual activity unsafe.

Clinical-trial safety reviews have not shown a consistent increase in major cardiovascular events attributable to PDE5 inhibitors in appropriately selected patients. One review of cardiac safety in PDE5 inhibitor trials summarizes this broader evidence, while current consensus guidance still emphasizes individual cardiovascular assessment.

Vision and Hearing Warnings

Tadalafil and other PDE5 inhibitors carry warnings about rare cases of sudden vision loss associated with non-arteritic anterior ischemic optic neuropathy (NAION), as well as sudden hearing decrease or hearing loss. These warnings are described in the official Cialis label. A direct causal relationship is not established in every reported case, but these symptoms are treated as medical warnings.

Stop taking tadalafil and seek prompt medical attention if you experience sudden vision loss or a sudden decrease in hearing.

Drug Interactions That Can Increase Tadalafil Risks

Some of the most important tadalafil safety issues come from drug interactions rather than from tadalafil alone. The prescribing information describes contraindicated combinations and situations in which dose adjustment or extra caution may be needed.

• Nitrates, including nitroglycerin and isosorbide products: contraindicated because of the risk of severe hypotension

• Riociguat and other guanylate cyclase stimulators: contraindicated

• Alpha-blockers and some antihypertensive drugs: may increase the risk of low blood pressure in some people

• Strong CYP3A4 inhibitors: can increase tadalafil exposure and may require dose adjustment

• Large amounts of alcohol: can add to vasodilation and increase dizziness or low blood pressure

How Long Can You Take Cialis?

There is no single maximum number of years that applies to everyone. Published long-term tadalafil studies provide safety data over extended treatment periods, while real-world treatment may continue longer when tadalafil remains appropriate and effective.

A clinician may periodically reassess whether the medication is still needed, whether the dose remains appropriate, whether other medicines have changed, and whether new health conditions alter the risk-benefit balance.

What Happens If You Stop Taking Tadalafil?

Tadalafil does not cause a recognized withdrawal syndrome. After the medicine is stopped and clears from the body, its treatment effect wears off. The drug’s pharmacology and elimination are summarized in StatPearls and the official prescribing information.

For erectile dysfunction, erectile function generally returns toward the untreated baseline. If function appears worse than it was years earlier, that can reflect progression of the underlying condition or changes in cardiovascular, metabolic, hormonal, or psychological factors rather than withdrawal from tadalafil itself.

How To Reduce the Risk of Tadalafil Side Effects

• Take tadalafil only as prescribed and do not take more than the recommended dose.

• Do not use tadalafil with nitrates or riociguat; these combinations are contraindicated in the FDA prescribing information.

• Tell your prescriber about alpha-blockers, blood-pressure medicines, and other drugs that may interact with tadalafil.

• Discuss kidney or liver disease before treatment because dosing may need to be adjusted.

• Limit heavy alcohol use, which can worsen dizziness and low blood pressure.

• Seek medical care promptly for severe or unusual symptoms rather than trying to manage them by changing the dose yourself.

When To Contact a Healthcare Professional

Contact your prescriber if common side effects are persistent, worsening, or interfering with daily life, or if you develop a new health condition or start a medication that could interact with tadalafil.

Seek urgent or emergency care for an erection lasting more than four hours, sudden vision or hearing loss, fainting, severe allergic symptoms, or chest pain. These warning symptoms are consistent with the FDA safety information for tadalafil.

Disclaimer

Disclaimer: This website connects patients with licensed healthcare providers who can evaluate medical conditions and prescribe medications when appropriate. Some medications available through this service may be compounded drugs, which are customized formulations prepared by a pharmacy. The FDA does not conduct premarket review for compounded drugs to evaluate their safety, effectiveness, or quality. (See here: https://www.fda.gov/consumers/consumer-updates/it-really-fda-approved). Individual results may vary, and these medications should only be used under the guidance of a qualified healthcare professional. The information in this article is for educational purposes only and should not be considered medical advice. Always consult your healthcare provider before starting any new treatment.