Answer
The supplied passage does not explain why, but states that atomoxetine hydrochloride and monoamine oxidase inhibitors must not be used together and that at least two weeks must separate stopping either medicine and starting the other.
Sources for this answer
- Atomoxetine 10 mg Capsules, HardViatris (formerly Mylan or Upjohn) · emc · SmPC §4.3 Contraindications · Version 4Document updated
Sources checked