Prolia Side Effects: What to Expect and When to Call Your Doctor

Prolia (denosumab) is a generally well-tolerated medication for most people, but it does carry significant warnings that every patient should understand before starting treatment. From mild muscle aches to life-threatening low calcium levels, here's a complete look at Prolia's side effect profile — organized by severity so you know what to watch for.

Boxed Warning: Severe Hypocalcemia (Low Blood Calcium)

In January 2024, the FDA added a Boxed Warning — its strongest warning — to Prolia for the risk of severe hypocalcemia in patients with advanced chronic kidney disease (CKD), especially those on dialysis or with CKD-mineral and bone disorder (CKD-MBD). Severe hypocalcemia caused hospitalizations, life-threatening events, and deaths.

Hypocalcemia symptoms include:

• Muscle cramps or spasms
• Numbness or tingling in fingers, toes, or around the mouth
• Irregular heartbeat or fast heart rate
• Seizures

All patients taking Prolia should supplement with at least 1,000 mg of calcium and 400 IU of vitamin D daily, unless instructed otherwise by their provider.

Common Side Effects (Reported in ≥10% of Patients)

The most common side effects of Prolia — occurring in 10% or more of patients — include:

• Back pain
• Pain in the arms and legs
• Muscle pain (myalgia)
• High cholesterol (hypercholesterolemia)
• Arthralgia (joint pain)

These side effects are generally mild and often improve after the first few doses. However, any new or worsening musculoskeletal pain that is severe should be reported to your provider.

Serious Side Effects That Require Prompt Medical Attention

These are less common but can be serious or life-threatening:

• Osteonecrosis of the jaw (ONJ): Reduced blood supply to the jawbone, often associated with dental procedures. Report jaw pain, swelling, loose teeth, or poor wound healing after dental work immediately.
• Atypical femoral fractures: Unusual fractures of the thigh bone (femur) can occur even with little trauma. Report new or unusual pain in your thigh, hip, or groin.
• Serious infections: Prolia can suppress immune function. Report symptoms of infection (fever, chills, skin redness/warmth, burning urination) promptly. Serious skin infections like cellulitis have been reported.
• Severe allergic reactions (anaphylaxis): Throat tightness, facial swelling, hives, difficulty breathing. Seek emergency care immediately.
• Vertebral fractures after stopping Prolia: A unique risk of denosumab. Do not stop Prolia without a transition plan from your provider.

Skin-Related Side Effects

Prolia can cause skin problems including dermatitis, eczema, rashes, and in rare post-approval cases, lichenoid drug eruptions and vasculitis. Report persistent, worsening, or spreading skin reactions to your provider.

Important Precautions to Take While on Prolia

To minimize side effect risk while on Prolia:

1. Take daily calcium (1,000 mg) and vitamin D (400 IU) supplements as recommended by your provider.
2. See your dentist before starting Prolia and practice good oral hygiene throughout treatment.
3. Tell your dentist you're on Prolia before any dental procedures.
4. Get all scheduled blood tests (calcium, kidney function) as directed.
5. Never stop Prolia suddenly without talking to your doctor first.

Also see: Prolia Drug Interactions: What to Avoid and What to Tell Your Doctor.

Having trouble accessing Prolia? medfinder can help you find providers who can administer your injection on time.