Which study design is most effective for investigating rare adverse effects of a drug?
ACohort study
BCross-sectional study
CCase-control study
DClinical trial/experimental study
Which one of the following drugs has a narrow therapeutic range?
APropranolol
BPhenytoin
CPiroxicam
DPrazosin
Which of the following statements about phase IV clinical trials is correct?
AIt is primarily focused on the efficacy of the drug.
BIt involves monitoring the long-term effects and safety of drugs.
CIt is conducted before a drug is submitted for approval.
DIt focuses primarily on determining the optimal dosage for patients.
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