Answer
Singulair (montelukast) has no or negligible influence on driving or using machines, but some individuals have reported drowsiness or dizziness.
Sources for this answer
- Singulair Paediatric 5 mg Chewable TabletsOrganon Pharma (UK) Limited · emc · SmPC §4.7 Effects on ability to drive and use machines · Version 19Document updated
Sources checked