Seldane Side Effects
Generic Name: terfenadine
Note: This page contains side effects data for the generic drug terfenadine. It is possible that some of the dosage forms included below may not apply to the brand name Seldane.
It is possible that some side effects of Seldane may not have been reported. These can be reported to the FDA here. Always consult a healthcare professional for medical advice.
For the Consumer
Applies to terfenadine: oral tablet
If you experience any of the following serious side effects, stop taking terfenadine (the active ingredient contained in Seldane) and call your doctor immediately or seek emergency medical attention.
an allergic reaction (difficulty breathing; closing of your throat; swelling of your lips, tongue, or face; or hives);
an irregular heartbeat; or
If you experience any of the following less serious side effects, continue taking terfenadine and talk to your doctor:
drowsiness or dizziness;
nausea, diarrhea, or abdominal discomfort;
dry mouth; or
dry skin or itchiness.
Side effects other than those listed here may also occur. Talk to your doctor about any side effect that seems unusual or that is especially bothersome.
For Healthcare Professionals
Applies to terfenadine: oral tablet
Terfenadine use may cause prolongation of the QT interval. Most cardiovascular events related to terfenadine (the active ingredient contained in Seldane) occur in patients taking more than the recommended dose of 60 mg twice a day, in patients with higher-than-normal terfenadine serum concentrations, and in patients who are at risk for cardiac events. Patients with liver disease are also at risk of cardiovascular toxicity due to potential accumulation of the drug. Other predisposing factors for cardiovascular toxicity include congenital forms of QT interval prolongation, coronary artery disease, and electrolyte disorders including hypokalemia and hypomagnesemia. Although rare, arrhythmias have been reported in patients on recommended doses without apparent risk factors.
Cardiovascular toxicity has been associated with the use of terfenadine. Reported effects include dizziness, syncopal episodes, palpitations, ventricular arrhythmias (including torsades de pointes), cardiac arrest, and cardiac death.
Headaches have been reported in approximately 6% of treated patients. Terfenadine (the active ingredient contained in Seldane) has not been demonstrated to cause significant drowsiness, sedation, or impaired psychomotor skills.
Gastrointestinal effects of terfenadine (the active ingredient contained in Seldane) are rare and include nausea and dry mouth.
A study of the effects of terfenadine (the active ingredient contained in Seldane) on the urination of eight healthy male volunteers and 11 males with benign prostatic hypertrophy was not able to confirm a consistent effect on voiding characteristics.
Urinary retention has been reported rarely.
Acute hepatitis, cholestatic hepatitis, and jaundice have been reported rarely in patients taking terfenadine (the active ingredient contained in Seldane) Hepatic dysfunction has been reversible upon discontinuation of the drug.
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