Minocycline is an antibiotic medication that is used to treat various bacterial infections. While weight gain is not a common side effect of minocycline, it is still possible that it could be contributing to your weight gain.

There are several factors that could contribute to weight gain, including changes in appetite or metabolism, hormonal imbalances, stress, or underlying medical conditions. It's also possible that your weight gain is unrelated to your medication and could be due to other factors such as changes in your diet or physical activity level.

Have you had any lifestyle changes lately?