Glatiramer acetate for multiple sclerosis

Examples

Generic Name	Brand Name
glatiramer acetate	Copaxone

How It Works

Glatiramer acetate (formerly known as copolymer-1) is an artificial protein that resembles a natural myelin protein. It is not known exactly how the medication works, but it may help people who have multiple sclerosis (MS) by preventing the body's immune system from attacking the myelin coating that protects nerve fibres.

Glatiramer acetate is given as an injection beneath the skin once a day. An oral tablet form has been tested but failed to show any benefit for people with MS.

Why It Is Used

Glatiramer acetate may be used to treat people 18 years or older who have relapsing-remitting MS. It is not approved to treat other forms of MS.

How Well It Works

Glatiramer acetate significantly reduces the frequency of relapses in those with relapsing-remitting MS. It also slows the number of new lesions (tissue damage) as seen on MRI and decreases disability.¹

Glatiramer acetate can slow the rate of new lesions in those with relapsing-remitting MS, without the flu-like symptoms that interferon beta medications can cause.¹ However, it may not be as effective at reducing disability as interferon beta.²

Glatiramer acetate has not been shown to be effective for people who have secondary progressive MS. Also, the medication is not helpful for people who have primary progressive MS.

Side Effects

Some people may have temporary side effects right after the shot (post-injection reaction), which can include:

• Pain, redness, or swelling at the injection site.
• Flushing.
• Chest pain, rapid heartbeat, and shortness of breath similar to that experienced in a heart attack.
• Anxiety.
• Tightness in the throat.

These side effects are usually mild and go away on their own shortly after the injection. You may have one or several brief episodes of these side effects during your treatment with glatiramer acetate.

Although less common, other side effects may occur, including:

• Weakness.
• Nausea.
• Joint pain.
• Severe muscle tension or spasticity.
• Skin rash.
• Impotence or decreased interest in sex.

See Drug Reference for a full list of side effects. (Drug Reference is not available in all systems.)

What To Think About

Glatiramer acetate may be used if you have tried interferon beta and the medication has not been effective or you cannot tolerate the side effects. Generally, glatiramer acetate is well-tolerated and does not cause the flu-like side effects that occur when taking interferon beta medications. However, it may take up to 7 months for any benefit from glatiramer acetate to occur. Benefit from interferon beta occurs within 1 month of starting treatment.

Treatment with glatiramer acetate should not be started until it is clear that you have the relapsing-remitting form of MS. The Canadian MS Clinics Network and the Multiple Sclerosis Society of Canada recommend that treatment with glatiramer acetate or one of the interferon medications be started as soon as a clear diagnosis is made.³

In addition to side effects, there are some drawbacks to treatment with glatiramer acetate:

• Treatment is not effective at all for some people, and it is hard to predict whether the medication will help a particular person.
• The long-term risks of treatment are unknown. It is possible that long-term use of the medication may lower the body's defence against other diseases. For people with mild MS, the benefits may not be worth the possible risks.
• Treatment may cost more than $15,000 per year. Your provincial health plan may cover most or all of the cost of your medicine. Ask your doctor or contact your provincial health plan for more information.

If you are taking glatiramer acetate, do not stop taking it without first talking with your doctor.

Complete the new medication information form (PDF)(What is a PDF document?) to help you understand this medication.

Author:	Douglas Dana Shannon Erstad, MBA/MPH	Last Updated: August 14, 2006
Medical Review:	Adam Husney, MD - Family Medicine Kathleen Romito, MD - Family Medicine Colin Chalk, MD, CM, FRCPC - Neurology Barrie J. Hurwitz, MD - Neurology
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