What Are the Common Side Effects of Osteoporosis Medications?

The sorted list you actually wanted

You got the prescription, you unfolded the paper insert, and now you have forty things that "may" happen and no sense of which ones matter. That is the gap this page fills: the side effects of osteoporosis medications, sorted by class, split into "common and usually mild" and "rare and worth a phone call."

If you want the big-picture tour of what each drug does, start with our plain-English guide to osteoporosis medications. This article stays narrow on side effects. For a ranking of the options by safety profile, read which osteoporosis treatment has the fewest side effects, and for the bisphosphonate family on its own, are Fosamax and its cousins worth the risk.

Physicians prescribe these medications because they lower fracture risk, and most women take them without a serious problem. Knowing the side effects is how you take a medication well and keep your physician informed, not a reason to start, stop, or change a prescription on your own. That decision belongs to you and your physician.

Side effects of osteoporosis medications at a glance

Bisphosphonates: the tablets and the yearly infusion

Oral: alendronate, risedronate, ibandronate

Digestive complaints top the list. Heartburn, an upset stomach, and a sore throat or chest are the reasons most women call about, and the famous instructions (empty stomach, a full glass of plain water, stay upright afterward) exist because the tablet can irritate or ulcerate the esophagus on its way down. Muscle and joint aches are the other common complaint, usually in the first weeks.

The two rare ones you have read about are osteonecrosis of the jaw and atypical femoral fracture, both uncommon at osteoporosis doses. Jaw problems cluster around invasive dental work, so tell your dentist what you take. Atypical femoral fractures often announce themselves weeks ahead with a dull ache in the thigh or groin. Because both risks are tied to years of use, many physicians reassess after 3 to 5 years and consider a supervised drug holiday.

IV: zoledronic acid (Reclast)

The infusion skips your stomach entirely. The trade is an acute-phase reaction: many people feel flu-like for a day or two after the first infusion, and it usually fades with later doses. Your physician checks kidney function and vitamin D before you receive it. The rare jaw and thigh risks are the same as the oral forms.

What are the side effects of Prolia?

The common list is unglamorous: back pain, muscle and joint pain, and a somewhat higher rate of bladder and skin infections. The serious list is short but specific. Prolia can drop blood calcium, especially in people with reduced kidney function, so calcium and vitamin D are usually prescribed with it and checked. Cellulitis, a spreading skin infection, is uncommon but needs same-day care. Jaw osteonecrosis and atypical femoral fracture are documented at rare rates, as with bisphosphonates.

Then there is the side effect no one expects, because it happens when you stop. Denosumab does not linger in bone the way bisphosphonates do. When injections end without a follow-on medication, bone turnover rebounds sharply, and rapid bone loss and multiple vertebral fractures have been documented. Prolia is never stopped without a physician's exit plan, usually a bisphosphonate. If your six-month appointment is slipping, call your prescriber that week.

Evista (raloxifene) side effects

Raloxifene gives bone an estrogen-like signal without acting like estrogen in the breast or uterus. The common effects are hot flashes (which is why it is rarely chosen for women whose main complaint is hot flashes), leg cramps, and mild swelling. The serious one is blood clots in the legs or lungs, which carries a boxed warning, along with stroke risk in women who already have heart-disease risk factors.

Hormone therapy side effects

Estrogen therapy, with progestin if you have a uterus, is FDA-approved for prevention of postmenopausal osteoporosis. The common effects are breast tenderness, bloating, spotting, and headaches. The serious ones are blood clots, stroke, and, with some combined regimens over years of use, breast cancer risk. Benefit and risk are individual, driven by your age, how long since menopause, and your breast cancer and clot history. We cover the whole picture in our article on HRT for bone health.

Forteo, Tymlos, and Evenity: the bone builders

Teriparatide (Forteo) and abaloparatide (Tymlos) are daily self-injections related to parathyroid hormone. The common effects are nausea, dizziness or lightheadedness shortly after a dose, leg cramps, and redness at the injection site. Blood calcium can run briefly high. Some people feel faint after the first doses, so physicians suggest sitting or lying down for them.

Romosozumab (Evenity) is a monthly injection for 12 doses. The common effects are joint pain, headache, and injection-site reactions. It carries a boxed warning for heart attack, stroke, and cardiovascular death, and it is not started within a year of either event. Both bone builders are a fixed course, always followed by an antiresorptive to protect the new bone. How that sequence is timed is covered in how long you take osteoporosis medication.

Which side effects should you report immediately?

Most side effects belong in a note for your next visit. These belong in a phone call the same day:

• Chest pain, sudden shortness of breath, or one-sided leg swelling or pain (possible clot on Evista or hormone therapy; possible heart event on Evenity).
• Sudden weakness, a drooping face, or trouble speaking (possible stroke; call 911).
• Painful or difficult swallowing, or chest pain after a bisphosphonate tablet (esophageal irritation).
• A dull thigh or groin ache that lingers for weeks on any antiresorptive or Evenity (the warning sign of an atypical femoral fracture).
• Jaw pain, loose teeth, exposed bone, or a dental socket that will not heal (osteonecrosis of the jaw).
• Tingling around the mouth, muscle cramps, or spasms on Prolia (low calcium).
• A red, hot, swollen patch of skin with fever on Prolia (cellulitis).
• Fainting or severe dizziness after a Forteo or Tymlos dose.
• A missed or overdue Prolia injection. Not a side effect, but the most important call on this list.

Our questions to ask your doctor about osteoporosis treatment includes the side-effect questions worth asking before you start.

Why non-drug loading has no drug interactions

Every medication above works in your chemistry: it slows the cells that remove bone, stimulates the cells that build it, or supplies a hormone signal. Osteogenic loading works on a different input entirely. Bone adapts to mechanical strain above a threshold (Wolff's law), and the osteogenic loading literature, citing Deere et al., puts that threshold at roughly 4.2 times body weight. A session at our Austin and Georgetown centers delivers that load in your strongest range of motion, on four devices, with a coach beside you, in about 15 minutes once a week, in street clothes, with no impact.

Because there is nothing to metabolize, there is nothing to interact. That is why more than 100 Austin-area physicians refer patients to OsteoStrong while those patients stay on their prescriptions, and why our session protocols are reviewed on an ongoing basis with the physicians who refer to us. Among members who follow the weekly protocol and complete a follow-up DEXA, 8 out of 10 see measurable improvement, with consistency and starting point as the biggest factors, whether they are on a bisphosphonate, Prolia, hormone therapy, or nothing at all.

See how OsteoStrong fits as a drug-free osteoporosis treatment alternative in Austin, what the four-pillar non-drug plan looks like alongside a prescription, and the step-by-step mechanism on our how it works page.

The bottom line

The side effects of osteoporosis medications sort into two lists. The common ones are mostly digestive, achy, or injection-related. The rare ones are specific, they have warning signs, and your physician monitors for them. Prolia adds one rule of its own: never stop without an exit plan. And whichever medication you and your physician choose, the mechanical side of bone building has no interactions to worry about.

Want to know where osteogenic loading fits alongside your prescription? Book a free Bone Health Roadmap Call, bring your DEXA and your medication list, and we will walk through it with you.

This article is for general education and is not medical advice. Medication facts are drawn from publicly available prescribing information and the Bone Health & Osteoporosis Foundation. Talk to your own doctor before starting, stopping, or changing any medication, supplement, or exercise program, especially if you have a diagnosis of osteopenia or osteoporosis.

Frequently asked questions