Which medication has therapeutic effects including improving rigidity, reducing sialorrhea, muscle relaxant, and sedative effects?

• A. Benadryl therapeutic effects
• B. Cogentin
• C. Adverse effects
• D. Pregnancy effects

Answer: (B)

The medication class being tested here is anticholinergic therapy used to treat Parkinsonian symptoms. Cogentin, which is benztropine, fits best because it works by blocking acetylcholine in the brain. In Parkinsonism, there’s an imbalance between dopamine and acetylcholine; reducing acetylcholine activity helps lessen rigidity and tremor and can also help with drooling (sialorrhea) by decreasing parasympathetic output to the salivary glands. The sedative and muscle-relaxant effects come from its central nervous system depressant actions as an anticholinergic, which can calm some of the motor hyperactivity and associated symptoms.

Regarding the other options, benadryl (diphenhydramine) is an antihistamine with anticholinergic effects, but it’s not the standard therapy for improving rigidity and sialorrhea and is more commonly used for allergies, sleep, or motion sickness. The remaining choices aren’t medications at all—one refers to adverse effects and the other to pregnancy effects—so they don’t address treatment of Parkinsonian symptoms.

So benztropine (Cogentin) is the best fit for improving rigidity, reducing sialorrhea, and providing muscle relaxant and sedative effects.