This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Pharmacology
Which of the following antiglaucoma medications can cause drowsiness ? 
Select and explain. 
A. Latanoprost, B. Timolol, C. Brimonidine, D. Dorzolamide
C: Brimonidine
Answer: C: Brimonidine 
Explanation: Ans. is 'c' i.e., Brimonidine o The main side effects of brimonidine are dry mouth, sedation (drowsiness) and small fall in in BP. o Simple funda to solve this question is that all oc, agonists (clonidine, brimonidine) have central action --> all ot2 agonists can cause sedation, mental depression, disturbed sleep.