No Changes Needed to Your Strattera
You can continue taking your Strattera (atomoxetine) at your current dose without any adjustments now that you're on amlodipine 5 mg. There is no clinically significant drug interaction between these two medications that requires dose modification.
Why These Medications Can Be Taken Together Safely
Different Metabolic Pathways
- Strattera is metabolized primarily through CYP2D6 1, a specific liver enzyme pathway
- Amlodipine is metabolized through CYP3A4 2, a completely different enzyme system
- Because they use separate pathways, they don't interfere with each other's breakdown in the body
No Documented Interactions
The evidence shows that amlodipine can be safely combined with atomoxetine:
- Guidelines for cardiovascular medications explicitly state that amlodipine has no evidence of significant interaction with medications metabolized by other pathways 2
- Amlodipine is commonly used in patients taking various psychiatric medications without dose adjustments needed 3
What You Should Monitor
While no dose changes are needed, be aware of these routine monitoring points:
Blood Pressure and Heart Rate
- Both medications can affect cardiovascular parameters
- Strattera can increase blood pressure and heart rate 4, 1, while amlodipine lowers blood pressure 3
- These effects may partially offset each other, but your provider should still check your blood pressure regularly 1
Common Side Effects to Watch
Continue monitoring for typical Strattera side effects 1:
- Decreased appetite
- Nausea or upset stomach
- Dizziness
- Mood changes
Important Caveat
The only scenario requiring caution would be if you're ever prescribed CYP2D6 inhibitors (like fluoxetine, paroxetine, or quinidine), which would significantly increase Strattera levels 4, 1. Amlodipine is not one of these medications.
Bottom line: Continue both medications as prescribed. No action needed on your part regarding the Strattera.