Drug Interactions between Cycloset and Technivie

GENERALLY AVOID: Coadministration with potent inhibitors of CYP450 3A4 may significantly increase the plasma concentrations of bromocriptine. Orally administered bromocriptine is extensively metabolized in the gastrointestinal tract and liver by CYP450 3A4, with approximately 93% of the absorbed dose undergoing first-pass metabolism and only the remaining 7% reaching systemic circulation. As such, inhibitors of CYP450 3A4 may markedly reduce the metabolic clearance of bromocriptine. The interaction has been studied with erythromycin, a moderate CYP450 3A4 inhibitor. When a single 5 mg oral dose of bromocriptine was given following a 4-day treatment of erythromycin estolate 250 mg four times a day in five male volunteers, mean bromocriptine peak plasma concentration (Cmax) and systemic exposure (AUC) increased by 4.6- and 3.7-fold, respectively, compared to administration of bromocriptine alone. An even greater magnitude of interaction should be expected with more potent inhibitors. High bromocriptine plasma levels may increase the frequency and/or severity of adverse effects such as nausea, headache, dizziness, somnolence (e.g., episodes of sudden sleep onset), hypotension, syncope, and impulse control problems or compulsive behaviors (e.g., gambling or sexual urges; uncontrolled spending).

MANAGEMENT: Concomitant use of bromocriptine with potent CYP450 3A4 inhibitors should be avoided when possible. In patients who have been treated with a potent CYP450 3A4 inhibitor, an adequate washout of the inhibitor (approximately 3 to 5 elimination half-lives) is recommended prior to initiation of bromocriptine. If coadministration with a potent CYP450 3A4 inhibitor is required, bromocriptine dosage should be reduced to avoid toxicity. Caution and close monitoring for development of adverse effects are advisable, and the bromocriptine dosage further adjusted if necessary.

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MONITOR: Clearance of hepatitis C virus (HCV) infection with direct acting antiviral agents (DAAs) may lead to changes in hepatic function which may result in altered blood glucose control. Serious symptomatic hypoglycemia has been reported in diabetic patients in postmarketing case reports and published epidemiological studies. These cases required either discontinuation or dose modification of concomitant medications used for diabetes treatment.

MANAGEMENT: Blood glucose should be closely monitored during treatment of HCV with DAAs, particularly during the first 3 months, and appropriate changes made to the antidiabetic drug regimen as needed. The patient as well as the healthcare providers in charge of diabetic care should be apprised of the risk of hypoglycemia. Patients should be aware of the potential signs and symptoms of hypoglycemia such as headache, dizziness, drowsiness, nervousness, confusion, tremor, hunger, weakness, perspiration, palpitation, and tachycardia. For antidiabetic medications that are not glucose-dependent, reduction in the dosage should be considered to mitigate the risk of hypoglycemia.

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MONITOR: Clearance of hepatitis C virus (HCV) infection with direct acting antiviral agents (DAAs) may lead to changes in hepatic function which may result in altered blood glucose control. Serious symptomatic hypoglycemia has been reported in diabetic patients in postmarketing case reports and published epidemiological studies. These cases required either discontinuation or dose modification of concomitant medications used for diabetes treatment.

MANAGEMENT: Blood glucose should be closely monitored during treatment of HCV with DAAs, particularly during the first 3 months, and appropriate changes made to the antidiabetic drug regimen as needed. The patient as well as the healthcare providers in charge of diabetic care should be apprised of the risk of hypoglycemia. Patients should be aware of the potential signs and symptoms of hypoglycemia such as headache, dizziness, drowsiness, nervousness, confusion, tremor, hunger, weakness, perspiration, palpitation, and tachycardia. For antidiabetic medications that are not glucose-dependent, reduction in the dosage should be considered to mitigate the risk of hypoglycemia.

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