The three FDA-approved medications for fibromyalgia are pregabalin (Lyrica), duloxetine (Cymbalta), and milnacipran (Savella). These are the only drugs specifically approved to treat the condition, though several others are commonly prescribed off-label. Each works through a different pathway in the nervous system, and none is a cure. For most people, they offer a moderate reduction in pain and related symptoms like poor sleep and fatigue.
How Well Do These Medications Work?
The honest answer: modestly. A review of clinical evidence found that for every 6 to 10 people who take one of these three medications, one person will experience at least a 30% reduction in pain. For a 50% pain reduction, the number needed to treat rises to 7 to 14. That means a meaningful portion of people who try these drugs won’t get significant relief, but a subset will notice a real difference in daily functioning.
This is worth keeping in mind when setting expectations. Fibromyalgia involves amplified pain signaling in the central nervous system, and no single medication fully corrects that. Most treatment plans combine medication with exercise, sleep management, and sometimes cognitive behavioral therapy.
Pregabalin (Lyrica)
Pregabalin is the only anticonvulsant (seizure medication) approved for fibromyalgia, and it’s one of the most extensively studied drugs for the condition. It works by blocking certain calcium channels on nerve cells, which reduces the release of pain-signaling chemicals. The net effect is a dampening of the overactive nerve firing that drives fibromyalgia pain.
The most common side effects are dizziness, drowsiness, dry mouth, blurred vision, weight gain, and swelling in the hands and feet. Some people also report difficulty concentrating, constipation, and increased appetite. Drowsiness can be significant, especially in the first few weeks, so many prescribers start at a lower dose and increase gradually.
Duloxetine (Cymbalta)
Duloxetine belongs to a class of antidepressants that increase the activity of two brain chemicals: serotonin and norepinephrine. Both play a role in the body’s natural pain-suppression pathways, so boosting their levels can help turn down pain signals. Duloxetine also tends to improve mood and quality of life, making it a particularly good fit when fibromyalgia overlaps with depression or anxiety.
The typical therapeutic dose for fibromyalgia is 60 mg once daily. Some people start at 30 mg for the first week to ease into the medication. Common side effects include nausea (especially early on), dry mouth, constipation, decreased appetite, drowsiness, increased sweating, and agitation. Nausea is often the side effect that prompts people to stop, but it frequently fades after the first couple of weeks.
In a meta-analysis comparing several antidepressants for fibromyalgia symptoms, duloxetine stood out for reducing pain and sleep disturbances while also improving depressed mood and overall quality of life. It did not, however, show strong effects on fatigue.
Milnacipran (Savella)
Milnacipran works through the same basic mechanism as duloxetine, boosting serotonin and norepinephrine. The key difference is in how it balances the two: milnacipran has a stronger effect on norepinephrine relative to serotonin. This distinction matters because norepinephrine plays a larger role in the descending pain pathways that help the brain inhibit pain signals coming from the body.
Unlike duloxetine, milnacipran is not approved as an antidepressant in the United States. It is marketed solely for fibromyalgia under the brand name Savella. Clinical evidence shows it reduces pain and sleep disturbances, though its effects on mood are less pronounced than duloxetine’s. Side effects are broadly similar to other drugs in its class: nausea, headache, constipation, dizziness, and increased heart rate.
How Doctors Choose Between Them
There is no clear winner among the three. The choice often depends on which symptoms are most disruptive. If depression or anxiety is a major part of the picture, duloxetine tends to be the first choice because of its dual benefit for mood. If sleep disruption and widespread nerve-type pain are the primary complaints, pregabalin may be preferred. Milnacipran is sometimes chosen when the other two haven’t worked well or have caused intolerable side effects.
In practice, finding the right medication often involves trial and error. A drug that works well for one person may do nothing for another, and side effects vary widely. If the first option doesn’t help after several weeks at a therapeutic dose, switching to one of the other two is a common next step.
Off-Label Medications Used Alongside
Beyond the three approved options, several medications are routinely prescribed off-label for fibromyalgia. Amitriptyline, an older tricyclic antidepressant, has strong evidence for improving pain, fatigue, and sleep disturbances, and some guidelines recommend it as a short-term first-line option. It’s especially useful when poor sleep is the dominant complaint.
Gabapentin works similarly to pregabalin and is sometimes substituted when pregabalin is too expensive or poorly tolerated. Cyclobenzaprine, a muscle relaxant, and fluoxetine (Prozac) are also used. Fluoxetine has shown modest benefits for pain and mood but does little for fatigue or sleep.
One notable absence from recommended treatment: standard painkillers. NSAIDs like ibuprofen and opioid medications are not recommended for fibromyalgia. NSAIDs target inflammation, which isn’t the primary driver of fibromyalgia pain. Opioids carry significant risks and have not demonstrated meaningful benefit for the condition. Tramadol is occasionally used as an exception because it has a unique mechanism that includes serotonin and norepinephrine effects alongside its opioid activity, but it remains a second- or third-line option.
What Medication Can and Cannot Do
All three approved medications aim to reduce symptoms, not eliminate them. A realistic goal is enough pain relief to re-engage with exercise, sleep better, and handle daily tasks with less difficulty. Exercise in particular has evidence as strong as or stronger than any medication for fibromyalgia, and the two work best in combination.
Many people cycle through more than one medication before landing on something that helps, and some find that a low dose of two different types of drugs (for example, an antidepressant plus pregabalin) works better than a high dose of one. The timeline for noticing benefit is typically four to six weeks at a stable dose, so patience during the adjustment period matters.