How safe is it to take medrol (methylprednisolone) 16mg once a day for 3 days and also what are it side effects. any future repercussions.

Safe. Many. Maybe.: Is Medrol (methylprednisolone) 16mg once daily for 3 days safe to take? In most cases, sure. But always, you need to chat w/your doc to be sure desired potential benefit exceeds potential risk of side effects, in this case, minimal if just for 3 days. But if taken for longer period of time, then many eg suppression of immune system, osteoporosis, elevated blood sugar (diabetes), striae (stretch marks), adrenal insuff.

See details: That dose short term should be fine. It should not causes any significant side effects or long term issues.