Drug Interaction Report

MONITOR: Theoretically, dopamine agonists (e.g., antiparkinson agents, ergot derivatives) and antagonists (e.g., neuroleptics, antiemetics) may affect imaging results obtained using ioflupane I-123, which binds to the dopamine transporter. However, their concomitant use has not been extensively studied. Whether discontinuation of these drugs prior to ioflupane I-123 administration may help to minimize potential interference is unknown.

MANAGEMENT: Clinicians using ioflupane I-123 should be aware of possible diagnostic interference by dopamine agonists and antagonists.

GENERALLY AVOID: Concurrent use of ethanol and phenothiazines may result in additive CNS depression and psychomotor impairment. Also, ethanol may precipitate dystonic reactions in patients who are taking phenothiazines. The two drugs probably act on different sites in the brain, although the exact mechanism of the interaction is not known.

MANAGEMENT: Patients should be advised to avoid alcohol during phenothiazine therapy.