Answer
Beta-blockers, including eye drops, can weaken or inhibit the effect of Oxis Turbohaler (formoterol), so they should not be used together unless there are compelling reasons.
Sources for this answer
- Oxis Turbohaler 6, inhalation powderAstraZeneca UK Limited · emc · SmPC §4.5 Interaction with other medicinal products · Version 20Document updated
Sources checked