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The following serious adverse reactions are discussed elsewhere in the labeling:
- Hypotension [see WARNINGS AND PRECAUTIONS]
- Vision loss [see WARNINGS AND PRECAUTIONS]
- Hearing loss [see WARNINGS AND PRECAUTIONS]
- Priapism [see WARNINGS AND PRECAUTIONS]
Clinical Trials Experience
Because clinical trials are conducted under widely varying conditions, adverse reaction rates observed in the clinical trials of a drug cannot be directly compared to rates in the clinical trials of another drug and may not reflect the rates observed in practice.
Tadalafil was administered to 398 patients with PAH during clinical trials worldwide. In trials of ADCIRCA (tadalafil tablets) , a total of 311 and 251 subjects have been treated for at least 182 days and 360 days, respectively. The overall rates of discontinuation because of an adverse event (AE) in the placebo-controlled trial were 9% for ADCIRCA (tadalafil tablets) 40 mg and 15% for placebo. The rates of discontinuation because of AEs, other than those related to worsening of PAH, in patients treated with ADCIRCA (tadalafil tablets) 40 mg was 4% compared to 5% in placebo-treated patients.
In the placebo-controlled study, the most common AEs were generally transient and mild to moderate in intensity. Table 1 presents treatment-emergent adverse events reported by ≥ 9% of patients in the ADCIRCA (tadalafil tablets) 40 mg group and occurring more frequently than with placebo.
TABLE 1: Treatment-Emergent Adverse Events Reported by ≥
9% of Patients in ADCIRCA (tadalafil tablets) and More Frequent than Placebo by 2%
|ADCIRCA 20 mg (%)
|ADCIRCA 40 mg (%)
|Respiratory Tract Infection (Upper and Lower)||6||7||13|
|Pain in Extremity||2||5||11|
|Nasal Congestion (Including sinus congestion)||1||0||9|
The following adverse reactions have been identified during post-approval use of tadalafil. These events have been chosen for inclusion either because of their seriousness, reporting frequency, lack of clear alternative causation, or a combination of these factors.
Because these reactions are reported voluntarily from a population of uncertain size, it is not always possible to estimate reliably their frequency or establish a causal relationship to drug exposure. The list does not include adverse events that are reported from clinical trials and that are listed elsewhere in this section.
Cardiovascular and cerebrovascular — Serious cardiovascular events, including myocardial infarction, sudden cardiac death, stroke, chest pain, palpitations, and tachycardia, have been reported postmarketing in temporal association with the use of tadalafil. Most, but not all, of these patients had preexisting cardiovascular risk factors. Many of these events were reported to occur during or shortly after sexual activity, and a few were reported to occur shortly after the use of tadalafil without sexual activity. Others were reported to have occurred hours to days after the use of tadalafil and sexual activity. It is not possible to determine whether these events are related directly to tadalafil, to sexual activity, to the patient's underlying cardiovascular disease, to a combination of these factors, or to other factors [see WARNINGS AND PRECAUTIONS].
Ophthalmologic — Visual field defect, retinal vein occlusion, and retinal artery occlusion
Non–arteritic anterior ischemic optic neuropathy (NAION), a cause of decreased vision including permanent loss of vision, has been reported rarely postmarketing in temporal association with the use of PDE5 inhibitors, including tadalafil. Most, but not all, of these patients had underlying anatomic or vascular risk factors for development of NAION, including but not necessarily limited to: low cup to disc ratio (“crowded disc”), age over 50, diabetes, hypertension, coronary artery disease, hyperlipidemia, and smoking. It is not possible to determine whether these events are related directly to the use of PDE5 inhibitors, to the patient's underlying vascular risk factors or anatomical defects, to a combination of these factors, or to other factors [see WARNINGS AND PRECAUTIONS and PATIENT INFORMATION].
Otologic — Cases of sudden decrease or loss of hearing have been reported postmarketing in temporal association with the use of PDE5 inhibitors, including tadalafil. In some of the cases, medical conditions and other factors were reported that may have also played a role in the otologic adverse events. In many cases, medical follow-up information was limited. It is not possible to determine whether these reported events are related directly to the use of tadalafil, to the patient's underlying risk factors for hearing loss, a combination of these factors, or to other factors [see WARNINGS AND PRECAUTIONS and PATIENT INFORMATION].
Urogenital — Priapism [see WARNINGS AND PRECAUTIONS].
Read the Adcirca (tadalafil tablets) Side Effects Center for a complete guide to possible side effects »
Potential for Pharmacodynamic Interactions with ADCIRCA (tadalafil tablets)
Do not use ADCIRCA (tadalafil tablets) in patients who are using any form of organic nitrate [see CONTRAINDICATIONS]. In clinical pharmacology studies ADCIRCA (tadalafil tablets) potentiated the hypotensive effect of nitrates [see CLINICAL PHARMACOLOGY]. In a patient who has taken ADCIRCA (tadalafil tablets) , where nitrate administration is deemed medically necessary in a life–threatening situation, at least 48 hours should elapse after the last dose of ADCIRCA (tadalafil tablets) before nitrate administration is considered. In such circumstances, nitrates should still only be administered under close medical supervision with appropriate hemodynamic monitoring.
PDE5 inhibitors, including ADCIRCA (tadalafil tablets) , and alpha–adrenergic blocking agents are both vasodilators with blood-pressure-lowering effects. When vasodilators are used in combination, an additive effect on blood pressure may be anticipated. Clinical pharmacology studies have been conducted with coadministration of tadalafil with doxazosin, alfuzosin or tamsulosin [see WARNINGS AND PRECAUTIONS and CLINICAL PHARMACOLOGY].
PDE5 inhibitors, including ADCIRCA (tadalafil tablets) , are mild systemic vasodilators. Clinical pharmacology studies were conducted to assess the effect of tadalafil on the potentiation of the blood–pressure–lowering effects of selected antihypertensive medications (amlodipine, angiotensin II receptor blockers, bendroflumethiazide, enalapril, and metoprolol). Small reductions in blood pressure occurred following coadministration of tadalafil with these agents compared with placebo [see WARNINGS AND PRECAUTIONS and CLINICAL PHARMACOLOGY].
Both alcohol and tadalafil, a PDE5 inhibitor, act as mild vasodilators. When mild vasodilators are taken in combination, blood pressure–lowering effects of each individual compound may be increased. Substantial consumption of alcohol (e.g., 5 units or greater) in combination with ADCIRCA (tadalafil tablets) can increase the potential for orthostatic signs and symptoms, including increase in heart rate, decrease in standing blood pressure, dizziness, and headache. Tadalafil (10 mg or 20 mg) did not affect alcohol plasma concentrations and alcohol did not affect tadalafil plasma concentrations. [See WARNINGS AND PRECAUTIONS and CLINICAL PHARMACOLOGY].
Potential for Other Drugs to Affect ADCIRCA (tadalafil tablets)
Ritonavir initially inhibits and later induces CYP3A, the enzyme involved in the metabolism of tadalafil. At steady state of ritonavir (about 1 week), the exposure to tadalafil is similar as in the absence of ritonavir [see DOSAGE AND ADMINISTRATION, WARNINGS AND PRECAUTIONS, and CLINICAL PHARMACOLOGY].
Other Potent Inhibitors of CYP3A
Tadalafil is metabolized predominantly by CYP3A in the liver. In patients taking potent inhibitors of CYP3A such as ketoconazole, and itraconazole, avoid use of ADCIRCA [see WARNINGS AND PRECAUTIONS and CLINICAL PHARMACOLOGY].
Potent Inducers of CYP3A
Potential for ADCIRCA (tadalafil tablets) to Affect Other Drugs
Cytochrome P450 Substrates
Tadalafil is not expected to cause clinically significant inhibition or induction of the clearance of drugs metabolized by cytochrome P450 (CYP) isoforms (e.g., theophylline, warfarin, midazolam, lovastatin, bosentan) [see CLINICAL PHARMACOLOGY].
Tadalafil (10 mg and 20 mg once daily) does not potentiate the increase in bleeding time caused by aspirin [see CLINICAL PHARMACOLOGY].
P-glycoprotein (e.g., digoxin)
Coadministration of tadalafil (40 mg once daily) for 10 days did not significantly alter digoxin pharmacokinetics in healthy subjects [see CLINICAL PHARMACOLOGY].
Last reviewed on RxList: 4/4/2011
This monograph has been modified to include the generic and brand name in many instances.
Additional Adcirca Information
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