Scientists say 5 everyday medications may be crumbling bones from the inside — and most people on them have never been warned

What do they do to the bone? Something very treacherous. These medications are enzymatic inducers. They speed up the liver’s work so much that the liver starts destroying active vitamin D faster than the body can replace it. And without vitamin D, calcium simply cannot get into the bone. You can consume all the calcium in the world—milk, cheese, supplements—it won’t matter, because without vitamin D, the door to the bone is closed. When the body realizes calcium isn’t reaching the bone, it goes into emergency mode. It activates the parathyroid glands, which send a message: take calcium from the bones and put it in the blood. Your body starts robbing calcium from your bones to keep your blood levels stable. It’s as if your liver is devouring the very vitamin that protects your bones.

Did you find carbamazepine or phenytoin in your box? Now you understand why your neurologist may have ordered a vitamin D test. It wasn’t a random test. They were watching over your bones without you even realizing it. If you’ve been taking one of these medications for more than a year, talk to your neurologist. Ask about your vitamin D levels and whether your supplementation is adequate. And never stop an anticonvulsant on your own. Stopping suddenly can cause a severe seizure.

3. The Thyroid Medication That Can Double the Rate of Bone Loss

I need women to pay close attention here. I’m talking about thyroid hormones in excessive doses. Look in your box for levothyroxine. Brand names include Synthroid, Levoxyl, or Euthyrox. I’m almost certain many of you are holding this box right now.

Levothyroxine is one of the most prescribed drugs in the world. Millions of women over 50 take it every day for hypothyroidism. And let me tell you, the problem isn’t the medicine itself. Levothyroxine is an excellent drug. When the dose is right, it protects, it balances, it’s necessary. The problem is the dose. When the dose is higher than necessary, a condition we call iatrogenic hyperthyroidism (meaning it’s caused by the prescribed treatment), the excess thyroid hormone accelerates the bone remodeling cycle. And when I say accelerates, imagine this: instead of the bone rebuilding at a normal pace, the demolition team starts working at double speed. The construction team can’t keep up. The result is bone being destroyed faster than it’s being formed, every single day, silently.

Are you holding Puran T4 or Synthroid? Then answer me this: when was the last time you had your TSH checked? When was the last time your doctor re-evaluated your dose? Because many, and I mean many, women start on a dose and nobody adjusts it for 5, 8, or 10 years. The dose that was right at 55 might be too high at 65, and the excess is accelerating bone demolition without you feeling a thing. Your mission: go to your endocrinologist and ask, “Doctor, is my dose still appropriate? Do we need to re-evaluate?”

2. The Common Steroid That Kills Your Bone-Building Cells
Everyone knows this one. I’m talking about glucocorticoids, the famous corticosteroids. Look in your box for prednisone, prednisolone, dexamethasone, or deflazacort. Brand names include Meticorten, Prednicen, Decadron, or Calcort. This is the most well-known bone destroyer in medicine. It’s no secret; any doctor knows. But what many people don’t know is the speed at which it acts.

Corticosteroids are the most common cause of drug-induced osteoporosis worldwide. The medication is a triple threat. First, they kill osteoblasts, the builders, directly inhibiting new bone formation. The builders are sent home. Second, they reduce calcium absorption in the intestine. So even if you eat well, the calcium doesn’t get absorbed properly. Third, they increase calcium loss through the kidneys. Your body flushes calcium out in the urine. It’s a three-pronged attack.