Generic Name: tadalafil (ta DAL a fil)Brand names: Cialis, Adcirca
Tadalafil relaxes muscles and increases blood flow to particular areas of the body.
Tadalafil is used to treat erectile dysfunction (impotence).
Tadalafil may also be used for purposes other than those listed in this medication guide.
Tadalafil can decrease blood flow to the optic nerve of the eye, causing sudden vision loss. This has occurred in a small number of people taking tadalafil, most of whom also had heart disease, diabetes, high blood pressure, high cholesterol, or certain pre-existing eye problems, and in those who smoke or are over 50 years old. It is not clear whether tadalafil is the actual cause of vision loss.Stop using tadalafil and get emergency medical help if you have sudden vision loss.
If you have certain conditions, you may need a dose adjustment or special tests to safely take this medication. Before taking tadalafil, tell your doctor if you are allergic to any drugs, or if you have:
heart disease or heart rhythm problems;
a recent history a heart attack (within the past 90 days);
a recent history of stroke or congestive heart failure (within the past 6 months);
angina (chest pain);
high or low blood pressure;
kidney disease (or if you are on dialysis);
a blood cell disorder such as sickle cell anemia, multiple myeloma, or leukemia;
a bleeding disorder such as hemophilia;
a stomach ulcer;
retinitis pigmentosa (an inherited condition of the eye);
a physical deformity of the penis (such as Peyronie's disease); or
if you have been told you should not have sexual intercourse for health reasons.
Tadalafil can decrease blood flow to the optic nerve of the eye, causing sudden vision loss. This has occurred in a small number of people taking tadalafil, most of whom also had heart disease, diabetes, high blood pressure, high cholesterol, or certain pre-existing eye problems, and in those who smoke or are over 50 years old.It is not clear whether tadalafil is the actual cause of vision loss. Stop using tadalafil and get emergency medical help if you have sudden vision loss. FDA pregnancy category B: Although tadalafil is not for use in women, this medication is not expected to be harmful to an unborn baby. Do not use tadalafil without telling your doctor if you are pregnant or plan to become pregnant during treatment. Although tadalafil is not for use in women, it is not known if tadalafil passes into breast milk or if it could harm a nursing baby. Do not use this medication without telling your doctor if you are breast-feeding a baby.
Take tadalafil exactly as it was prescribed for you. Do not take it in larger doses or for longer than recommended by your doctor. Taking this medication in larger doses will not make it more effective, and could cause dangerous side effects.
Tadalafil can be taken with or without food.
Tadalafil is usually taken only when needed, just before sexual activity. However, tadalafil may also be taken daily (at a lower dose), regardless of when sexual activity is planned. Follow your doctor's instructions.
Tadalafil can help achieve an erection when sexual stimulation occurs. An erection will not occur just by taking a pill. Follow your doctor's instructions.Do not take tadalafil more than once a day. Allow 24 hours to pass between doses. If you take the medication daily, take it at the same time each day. Contact your doctor or seek emergency medical attention if your erection is painful or lasts longer than 4 hours. A prolonged erection (priapism) can damage the penis. Store this medication at room temperature away from moisture and heat.
See also: Tadalafil dosage in more detail
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.
Overdose symptoms may include chest pain, nausea, irregular heartbeat, and feeling light-headed or fainting.
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.
Stop using tadalafil and call your doctor at once if you have any of these serious side effects:
sudden vision loss;
ringing in your ears, or sudden hearing loss;
chest pain or heavy feeling, pain spreading to the arm or shoulder, nausea, sweating, general ill feeling;
swelling in your hands, ankles, or feet;
shortness of breath;
feeling light-headed, fainting; or
Less serious side effects may include:
warmth or redness in your face, neck, or chest;
stuffy nose, sore throat;
diarrhea, upset stomach; or
muscle pain, back pain.
This is not a complete list of side effects and others may occur. Call your doctor for medical advice about side effects. You may report side effects to FDA at 1-800-FDA-1088.
Usual Adult Dose for Erectile Dysfunction:
10 mg orally taken prior to anticipated sexual activity. The maximum recommended dosing frequency is once per day in most patients.Alternatively, 2.5 mg orally once daily, without regard to timing of sexual activity. May increase to 5 mg orally once daily based on efficacy and tolerability.
Usual Adult Dose for Pulmonary Hypertension:
40 mg orally once daily, with or without food. Dividing the dose (40 mg) over the course of the day is not recommended.
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:
diclofenac (Arthrotec, Cataflam, Voltaren, Flector Patch, Solareze);
doxazosin (Cardura), prazosin (Minipress), terazosin (Hytrin);
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.