Q:

A 24 yer old schizophrenic has been under antipsychotic trement for the last 1 year and now complains of ED Erectyl Dysfunction). Which drug is most likely to have caused this?

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A 24 yer old schizophrenic has been under antipsychotic trement for the last 1 year and now complains of ED Erectyl Dysfunction). Which drug is most likely to have caused this?


  1. Fluoxetine
  2. Citalopram
  3. Clozapine
  4. Haloperidol
  5. Risperidone

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The key is E. Risperidone. [Haloperidol, raises serum prolactin levels to 20~40 ng/ml in therapeutic doses but risperidone causes around 171 ng/ml. High prolactin is responsible for erectyl dysfunction].

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