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In this Article

• What is tadalafil (Cialis)?
• What are the possible side effects of tadalafil (Cialis)?
• What is the most important information I should know about tadalafil (Cialis)?
• What should I discuss with my healthcare provider before taking tadalafil (Cialis)?
• How should I take tadalafil (Cialis)?
• What happens if I miss a dose (Cialis)?
• What happens if I overdose (Cialis)?
• What should I avoid while taking tadalafil (Cialis)?
• What other drugs will affect tadalafil (Cialis)?
• Where can I get more information?

What happens if I miss a dose (Cialis)?

Since tadalafil is used as needed, you are not likely to be on a dosing schedule.

If you take tadalafil every day and you miss a dose, take the missed dose as soon as you remember. If it is almost time for your next dose, wait until then to take the medicine and skip the missed dose. Do not take extra medicine to make up the missed dose.

What happens if I overdose (Cialis)?

Seek emergency medical attention if you think you have used too much of this medicine.

Overdose symptoms may include chest pain, nausea, irregular heartbeat, and feeling light-headed or fainting.

What should I avoid while taking tadalafil (Cialis)?

Avoid drinking alcohol, which can increase some of the side effects of tadalafil.

Grapefruit and grapefruit juice may interact with tadalafil. Discuss the use of grapefruit products with your doctor. Do not increase or decrease the amount of grapefruit products in your diet without first talking to your doctor.

Avoid using other medicines to treat impotence, such as alprostadil (Caverject, Muse, Edex) or yohimbine (Yocon, Yodoxin, others), without first talking to your doctor.

What other drugs will affect tadalafil (Cialis)?

Before taking tadalafil, tell your doctor about all other medications you use for erectile dysfunction, or if you are using any of the following medications:

• conivaptan (Vaprisol);
• diclofenac (Arthrotec, Cataflam, Voltaren, Flector Patch, Solareze);
• doxazosin (Cardura), prazosin (Minipress), terazosin (Hytrin);
• imatinib (Gleevec);
• isoniazid (for treating tuberculosis);
• rifampin (Rifadin, Rimactane);
• an antibiotic such as clarithromycin (Biaxin), dalfopristin/quinupristin (Synercid), erythromycin (E.E.S., EryPed, Ery-Tab, Erythrocin), or telithromycin (Ketek);
• an antifungal medication such as clotrimazole (Mycelex Troche), itraconazole (Sporanox), ketoconazole (Nizoral), or voriconazole (Vfend);
• an antidepressant such as nefazodone;
• heart or blood pressure medications;
• HIV/AIDS medicine such as amprenavir (Agenerase), atazanavir (Reyataz), darunavir (Prezista), delavirdine (Rescriptor), fosamprenavir (Lexiva), indinavir (Crixivan), nelfinavir (Viracept), saquinavir (Invirase, Fortovase), or ritonavir (Norvir), and others; or
• seizure medication such as carbamazepine (Tegretol), phenobarbital (Luminal), or phenytoin (Dilantin).

This list is not complete and there may be other drugs that can interact with tadalafil. Tell your doctor about all the prescription and over-the-counter medications you use. This includes vitamins, minerals, herbal products, and drugs prescribed by other doctors. Do not start using a new medication without telling your doctor.

Where can I get more information?

Your pharmacist can provide more information about tadalafil.

Remember, keep this and all other medicines out of the reach of children, never share your medicines with others, and use this medication only for the indication prescribed.

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