How long does it take my drug mirtazapine to expire?

Check on the package: If you have made the mistake of discarding the package before finishing the pills, you might ask the pharmacist. Instructions definitely say to discard after expiration date - they don't say any harm will occur, only lack of effectiveness. Take care, be as responsible toward yourself as you can. You are worth it.

Pharmacist: It's best to take the bottle of Mirtazapine to your pharmacist for this answer.