Anaphylaxis and angioedema requiring hospitalization and emergency medical treatment have occurred with the first or subsequent doses of DETROL. In the event of difficulty in breathing, upper airway obstruction, or fall in blood pressure, DETROL should be discontinued and appropriate therapy promptly provided.
Risk of Urinary Retention and Gastric Retention
DETROL Tablets should be administered with caution to patients with clinically significant bladder outflow obstruction because of the risk of urinary retention and to patients with gastrointestinal obstructive disorders, such as pyloric stenosis, because of the risk of gastric retention (see CONTRAINDICATIONS).
Decreased Gastrointestinal Motility
DETROL, like other antimuscarinic drugs, should be used with caution in patients with decreased gastrointestinal motility.
Controlled Narrow-Angle Glaucoma
DETROL should be used with caution in patients being treated for narrow-angle glaucoma.
Central Nervous System (CNS) Effects
Detrol is associated with anticholinergic central nervous system (CNS) effects including dizziness and somnolence (see Adverse Reactions). Patients should be monitored for signs of anticholinergic CNS effects, particularly after beginning treatment or increasing the dose. Advise patients not to drive or operate heavy machinery until the drug's effects have been determined. If a patient experiences anticholinergic CNS effects, dose reduction or drug discontinuation should be considered.
Reduced Hepatic and Renal Function
For patients with significantly reduced hepatic function or renal function, the recommended dose of DETROL is 1 mg twice daily (see CLINICAL PHARMACOLOGY, Pharmacokinetics in Special Populations).
Patients with Congenital or Acquired QT Prolongation
In a study of the effect of tolterodine immediate release tablets on the QT interval (see CLINICAL PHARMACOLOGY, Cardiac Electrophysiology), the effect on the QT interval appeared greater for 8 mg/day (two times the therapeutic dose) compared to 4 mg/day and was more pronounced in CYP2D6 poor metabolizers (PM) than extensive metabolizers (EMs). The effect of tolterodine 8 mg/day was not as large as that observed after four days of therapeutic dosing with the active control moxifloxacin. However, the confidence intervals overlapped. These observations should be considered in clinical decisions to prescribe DETROL for patients with a known history of QT prolongation or patients who are taking Class IA (e.g., quinidine, procainamide) or Class III (e.g., amiodarone, sotalol) antiarrhythmic medications (see PRECAUTIONS, Drug Interactions). There has been no association of Torsade de Pointes in the international post-marketing experience with DETROL or DETROL LA.
Information for Patients
Patients should be informed that antimuscarinic agents such as DETROL may produce the following effects: blurred vision, dizziness, or drowsiness. Patients should be advised to exercise caution in decisions to engage in potentially dangerous activities until the drug's effects have been determined.
Ketoconazole, an inhibitor of the drug metabolizing enzyme CYP3A4, significantly increased plasma concentrations of tolterodine when coadministered to subjects who were poor metabolizers (see CLINICAL PHARMACOLOGY, Variability in Metabolism and Drug-Drug Interactions). For patients receiving ketoconazole or other potent CYP3A4 inhibitors such as other azole antifungals (e.g., itraconazole, miconazole) or macrolide antibiotics (e.g., erythromycin, clarithromycin) or cyclosporine or vinblastine, the recommended dose of DETROL is 1 mg twice daily (see DOSAGE AND ADMINISTRATION).
Interactions between tolterodine and laboratory tests have not been studied.
Carcinogenesis, Mutagenesis, Impairment of Fertility
Carcinogenicity studies with tolterodine were conducted in mice and rats. At the maximum tolerated dose in mice (30 mg/kg/day), female rats (20 mg/kg/day), and male rats (30 mg/kg/day), AUC values obtained for tolterodine were 355, 291, and 462 µg∙h/L, respectively. In comparison, the human AUC value for a 2 mg dose administered twice daily is estimated at 34 µg∙h/L. Thus, tolterodine exposure in the carcinogenicity studies was 9- to 14-fold higher than expected in humans. No increase in tumors was found in either mice or rats.
No mutagenic effects of tolterodine were detected in a battery of in vitro tests, including bacterial mutation assays (Ames test) in 4 strains of Salmonella typhimurium and in 2 strains of Escherichia coli, a gene mutation assay in L5178Y mouse lymphoma cells, and chromosomal aberration tests in human lymphocytes. Tolterodine was also negative in vivo in the bone marrow micronucleus test in the mouse.
In female mice treated for 2 weeks before mating and during gestation with 20 mg/kg/day (corresponding to AUC value of about 500 µg∙h/L), neither effects on reproductive performance or fertility were seen. Based on AUC values, the systemic exposure was about 15-fold higher in animals than in humans. In male mice, a dose of 30 mg/kg/day did not induce any adverse effects on fertility.
Tolterodine, administered at oral doses of 20 mg/kg/day (approximately 14 times the human exposure), showed no anomalies or malformations in mice. When given at doses of 30 to 40 mg/kg/day, tolterodine has been shown to be embryolethal, reduce fetal weight, and increase the incidence of fetal abnormalities (cleft palate, digital abnormalities, intra-abdominal hemorrhage, and various skeletal abnormalities, primarily reduced ossification) in mice. At these doses, the AUC values were about 20- to 25-fold higher than in humans. Rabbits treated subcutaneously at a dose of 0.8 mg/kg/day achieved an AUC of 100 µg∙h/L, which is about 3-fold higher than that resulting from the human dose. This dose did not result in any embryotoxicity or teratogenicity. There are no studies of tolterodine in pregnant women. Therefore, DETROL should be used during pregnancy only if the potential benefit for the mother justifies the potential risk to the fetus.
Tolterodine is excreted into the milk in mice. Offspring of female mice treated with tolterodine 20 mg/kg/day during the lactation period had slightly reduced body weight gain. The offspring regained the weight during the maturation phase. It is not known whether tolterodine is excreted in human milk; therefore, DETROL should not be administered during nursing. A decision should be made whether to discontinue nursing or to discontinue DETROL in nursing mothers.
Efficacy in the pediatric population has not been demonstrated.
Two pediatric phase 3 randomized, placebo-controlled, double-blind, 12-week studies were conducted using tolterodine extended release (DETROL LA) capsules. A total of 710 pediatric patients (486 on DETROL LA and 224 on placebo) aged 5–10 years with urinary frequency and urge urinary incontinence were studied. The percentage of patients with urinary tract infections was higher in patients treated with DETROL LA (6.6%) compared to patients who received placebo (4.5%). Aggressive, abnormal, and hyperactive behavior and attention disorders occurred in 2.9% of children treated with DETROL LA compared to 0.9% of children treated with placebo.
Of the 1120 patients who were treated in the four Phase 3, 12-week clinical studies of DETROL, 474 (42%) were 65 to 91 years of age. No overall differences in safety were observed between the older and younger patients (see CLINICAL PHARMACOLOGY, Pharmacokinetics in Special Populations).