Repeated USMLE Questions Step 1- Review- 73- Pharmacology

Q- Which one of the following drugs most likely resembles the pharmacologic action of atropine?

A- Hexamethonium

B- Pilocarpine

C- Scopolamine

D- Succinylcholine

C- Scopolamine- Atropine and scopolamine are both anti-muscarinic drugs. It is used in cases of motion sickness and some cases of nausea and vomiting following surgery.

Q- Which of the following agents is used to improve the drug-induced form of Parkinsonism?

A- Bromocriptine

B- Benztropine

C- Dopamine

D- Levodopa

B- Benztropine- Drug-induced form of Parkinsonism occurs as a side effect of some drugs such as anti-psychotics, lithium, metoclopramide and MDMA addiction. Benztropine is the first line of treatment as it reduces the extrapyramidal side effects of these drugs.

Q- Synthesis of which one of the following substances is decreased due to the administration of finasteride in cases of benign prostatic hyperplasia?

A- Dihydrotestosterone

B- Epinephrine

C- Norepinephrine

D- Testosterone

A- Dihydrotestosterone- Finasteride inhibits the enzyme 5- α reductase that converts testosterone into dihydrotestosterone which is responsible for senile prostatic enlargement.

More Pharmacology MCQs

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