I took a year expired 100mg minocycline should i be concerned?

I won't worry: Unless u have any unusual or severe symptoms such as nausea, vomiting, abdominal pain, diarrhea etc. Most expired meds are safe to take although the potency is diminished. Take care!

Expired meds: The class of antibiotics called tetracyclines , of which Minocycline is one , can do damage to the kidneys after they're expired unlike many other medications. You probably won't experience any adverse effects but don't used expired medication.

Well: Just one won't hurt you but as a rule of thumb never take any expired medicines of the tetracycline group as they might be harmful. Other meds just are not as strong.