What are the five brand names for Timolol 0.5% and 0.25% formulations?

• A. Lumigan, Xalatan, Travatan, Zioptan
• B. Timoptic, Timoptic XE, Timolol Ocudose, Istalol, Betaimol
• C. Betoptic, Betoptic-S, Betagan, Ocudose
• D. Timoptic, Timoptic XE, Timolol Ocudose, Alrex, Istalol

Answer: (B)

Timolol is a nonselective beta-blocker used to lower intraocular pressure in POAG, and it’s sold under multiple brand names depending on concentration and formulation. The five names listed cover the Timolol ophthalmic solutions at two concentrations: standard 0.5% formulations and the 0.25% option. Timoptic and Timoptic XE are the well-known 0.5% Timolol products, while Istalol is another 0.5% Timolol formulation. Timolol Ocudose represents the 0.25% Timolol delivered in the Ocudose single-dose system, and Betaimol is another brand name used for Timolol 0.25% in various markets. Together, these names reflect the two Timolol concentrations available in different brands. The other choices list prostaglandin analogs or other types of eye drops (steroids), which are not Timolol products.