Salbutamol and Timolol: Drug Interaction Guide
Quick answer: This is a major interaction — avoid combining Salbutamol and Timolol unless specifically directed by your doctor.
How Salbutamol interacts with Timolol
Ophthalmic timolol systemically blocks beta-2 receptors on bronchial smooth muscle, antagonising salbutamol's bronchodilator effect and risking bronchospasm.
What you should do
Avoid timolol eye drops in patients with asthma or COPD; use a beta-1 selective alternative such as betaxolol if topical therapy is required.
Key facts
Severity
Major — avoid combination
Mechanism
Ophthalmic timolol systemically blocks beta-2 receptors on bronchial smooth muscle, antagonising salbutamol's bronchodil...
Action
Avoid timolol eye drops in patients with asthma or COPD; use a beta-1 selective alternative such as betaxolol if topical...
Frequently asked questions
Can I take Salbutamol and Timolol together?
No — this combination should generally be avoided. Avoid timolol eye drops in patients with asthma or COPD; use a beta-1 selective alternative such as betaxolol if topical therapy is required.
What is the severity of this interaction?
The interaction between Salbutamol and Timolol is classified as Major — avoid combination. Ophthalmic timolol systemically blocks beta-2 receptors on bronchial smooth muscle, antagonising salbutamol's bronchodilator effect and risking bronchospasm.
What should I do if I'm prescribed both?
Avoid timolol eye drops in patients with asthma or COPD; use a beta-1 selective alternative such as betaxolol if topical therapy is required. Always consult your prescribing clinician — do not stop or change medications without medical guidance.
Last reviewed: by iMedic Medical Editorial Team. Our editorial process.