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Block 5. CASE 5. Gabatino-Labra. CASE 5. Patient is a known schizophrenic maintained on Chlorpromazine 100 mg per orem 2x/day for 6 months . Two weeks prior to consult, he was prescribed Propranolol 40 mg/tablet 2 tablets 3x/day. QUESTION. What caused the symptoms of the patient?.
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Block 5 CASE 5 Gabatino-Labra
Patient is a knownschizophrenic • maintained on Chlorpromazine • 100 mg per orem 2x/day for 6 months. • Two weeks prior to consult, he was prescribed Propranolol • 40 mg/tablet 2 tablets 3x/day.
QUESTION • What caused the symptoms of the patient?
Metabolism Chlorpromazine CYP 2D6 typically degraded by the liver by the action of cytochrome-P450 family enzymes, usually CYP2D6 • 7-hydroxylation
Metabolism Propranolol CYP 2D6 • aromatic hydroxylation 4-hydroxy propranolol is a weak inhibitor of CYP2D6
Drug Interaction 70% Propranolol Chlorpromazine