Fibromyalgia - Medications

Highlights	Conditions with Similar Symptoms	Medications
Introduction	Prognosis	Resources
Causes	Treatment	References
Risk Factors	Lifestyle Changes
Diagnosis	Behavioral Therapy

Medications

To date, the FDA has not approved any drug for specific treatment of fibromyalgia. First-line drug therapy usually consists of an antidepressant or a muscle relaxant and is aimed at improving sleep and boosting pain tolerance. Medications from other drug classes (sleep agents, anti-convulsants, pain relievers) may also be prescribed. Drug therapy is administered in combination with exercise, patient education, and behavioral therapies.

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Antidepressants

The main classes of antidepressants used for treating fibromyalgia are tricyclics, selective serotonin-reuptake inhibitors (SSRIs), and serotonin/norepinephrine reuptake inhibitors (SNRIs). Although these drugs are antidepressants, they are used to improve sleep and relieve pain in non-depressed patients with fibromyalgia. The dosages used for managing fibromyalgia are generally lower than dosages prescribed for treating depression. If a patient has depression in addition to fibromyalgia, then higher doses may be required.

Tricyclics. Tricyclic antidepressants cause drowsiness and can be helpful for improving sleep. The tricyclic drug most commonly used for fibromyalgia is amitriptyline (Elavil, Endep), which produces modest benefits with pain, but which can lose effectiveness over time. Other tricyclics include desipramine (Norpramin), doxepin (Sinequan), imipramine (Tofranil), amoxapine (Asendin), and nortriptyline (Pamelor, Aventyl).

Generally only small doses are necessary for relief of fibromyalgia, so, although tricyclics have a number of side effects, they may occur less frequently in fibromyalgia patients than in those taking tricyclics for depression. Side effects most often reported include dry mouth, blurred vision, sexual dysfunction, weight gain, difficulty in urinating, disturbances in heart rhythm, drowsiness, and dizziness. Like all medications, tricyclics must be taken as directed; overdose can be life threatening.

Unfortunately, not all patients respond to tricyclics and their effects wear off in some patients, sometimes after only a month.

Selective Serotonin-Reuptake Inhibitors (SSRIs). Selective serotonin-reuptake inhibitors (SSRIs) increase serotonin levels in the brain, which may have specific benefits for fibromyalgia patients. Commonly prescribed SSRIs include fluoxetine (Prozac), sertraline (Zoloft), paroxetine (Paxil), and fluvoxamine (Luvox). Studies suggest they may improve sleep, fatigue, and well-being in many patients. Studies are mixed on whether they improve pain. In any case, they do not have any significant effect on tender points. SSRIs should be taken in the morning, since they may cause insomnia. Common side effects are agitation, nausea, and sexual dysfunction, including delayed or loss of orgasm and low sexual drive.