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There may be other drugs that can affect calcitonin injection. Tell your doctor about all the prescription and over-the-counter medications you use. This includes vitamins, minerals, herbal products, and drugs prescribed by other doctors. Do not start using a new medication without telling your doctor.

You may have increased bone pain during the first few months of treatment with calcitonin injection. This is not a sign that the medication isn't working properly.

Get emergency medical help if you have any of these signs of an allergic reaction: hives; difficulty breathing; swelling of your face, lips, tongue, or throat.

Call your doctor at once if you have any of these serious side effects:

• feeling light-headed, fainting; or

• muscle stiffness.

Less serious side effects may include:

• warmth, redness, itching, or tingly feeling under your skin;

• nausea, loss of appetite, stomach pain;

• vomiting;

• skin rash or itching;

• increased urination, especially at night;

• eye pain;

• swelling in your feet; or

• swelling or irritation of the skin where an injection was given.

This is not a complete list of side effects and others may occur. Tell your doctor about any unusual or bothersome side effect.