Final answer:
Carbonic anhydrase inhibitors should not be used in a patient with an allergy to sulfonamides.
Step-by-step explanation:
In a patient with an allergy to sulfonamides, carbonic anhydrase inhibitors should not be used as intraocular pressure (IOP) lowering drops. Carbonic anhydrase inhibitors, such as acetazolamide, inhibit the enzyme carbonic anhydrase and are commonly used to treat glaucoma. However, these medications contain a sulfonamide moiety, which can trigger an allergic reaction in patients with a known sulfonamide allergy.