Final answer:
Phenylephrine is a drug to avoid in acute angle closure glaucoma, while pilocarpine is a commonly used treatment for this condition.
Step-by-step explanation:
When it comes to treating acute angle closure glaucoma, a drug to avoid is phenylephrine. Phenylephrine is a sympathomimetic drug that causes dilation of the pupil, which can worsen the condition by narrowing the angle between the iris and cornea, leading to a further increase in intraocular pressure. Instead, drugs like pilocarpine are often used to treat acute angle closure glaucoma. Pilocarpine is a muscarinic agonist that constricts the pupil and causes the ciliary muscle to contract, facilitating the drainage of aqueous humor and reducing intraocular pressure.