Which medication is known to have possible respiratory side effects?

Timolol is a non-selective beta-blocker that is often used in ophthalmology to reduce intraocular pressure in patients with glaucoma. While its primary use is ocular, timolol can also affect respiratory function due to its non-selective action on beta receptors, which are present in the lungs. This medication may lead to bronchoconstriction, particularly in patients with underlying respiratory issues such as asthma or chronic obstructive pulmonary disease (COPD).

In contrast, the other medications listed have different profiles: Albuterol is a bronchodilator commonly used to treat asthma and other conditions by opening the airways, making it less likely to cause respiratory side effects. Prednisone, a corticosteroid, can have respiratory effects primarily related to long-term use, such as increased risk of infection, but is not typically associated with acute respiratory side effects. Montelukast is a leukotriene receptor antagonist used in asthma management and generally does not produce significant respiratory side effects. Therefore, timolol stands out as the medication with the most direct and potentially significant respiratory implications.