How Effective Is Hydroxychloroquine for Sjogren’s?

Hydroxychloroquine, often sold as Plaquenil, is one of the most commonly prescribed medicines for Sjögren’s. Its benefits are modest and uneven: some people notice a clear difference, and others very little. It tends to work better on aches and inflammation than on the dryness most people want relief from, which is why doctors treat it as a reasonable first try rather than a sure fix.

What the Biggest Trial Found

The key trial compared hydroxychloroquine with a placebo, a dummy pill with no active drug, in people with Sjögren’s.¹ After 24 weeks, about 18 in 100 people on the drug had their dryness, fatigue or pain scores improve by at least 30% in two of the three.² About 17 in 100 people taking the dummy pill improved just as much.³ Quality of life and mood scores did not differ between the groups either.⁴

Dummy-pill groups improve because Sjögren’s symptoms naturally rise and fall over months, and people often join a trial at a peak. Regular check-ins and expecting help can also lift how people rate pain and tiredness. That is why your own experience can’t settle the question; only a comparison group shows what the medicine adds.

A longer look hinted at more. By 48 weeks, about 30 in 100 people on the drug had improved versus about 19 in 100 on the dummy pill.⁵ That gap was small enough that it could have been chance.⁶ A slow, modest benefit for some people can’t be ruled out.

An average from one trial also has limits. It can hide a smaller group who respond well, and only three controlled trials have tested the drug at all.⁷ A reanalysis of the main trial by symptom type did find some differences between groups.⁸

Which Symptoms It Helps and Which It Doesn’t

Joint and muscle pain has the strongest case. Pooled across studies, about 49 in 100 people improved in pain on the drug, versus about 36 in 100 on the dummy pill.⁹ In one long-term study, pain and fatigue scores were lower at 8 weeks and still lower after a year.¹⁰ In one comparison, people not on the drug had more arthritis and fatigue.¹¹

Dry mouth may improve a little. Pooled studies found mouth symptoms improved more with the drug than without it.¹² In one study, resting saliva flow rose after 30 weeks, though people didn’t feel much different.¹³ In the main trial, saliva flow did not change.¹⁴ Saliva can measure higher in a clinic while your mouth feels just as dry day to day.

Dry eyes and fatigue show little benefit. One small trial found people reported less eye discomfort on the drug, but no more than on the dummy pill.¹⁵ Pooled studies found no clear improvement in eye dryness or fatigue.¹⁶ For fatigue, people did about as well or better on the dummy pill in pooled results.¹⁷

Stopping the drug tells its own story. In one study, eye surface damage and grittiness worsened when people stopped.¹⁸ So “I can’t feel it working” doesn’t necessarily mean it does nothing, and stopping on your own can backfire. Raise it with your doctor first.

What this means for you depends on your main symptom. If aching joints and muscles bother you most, you are in the group with the strongest evidence, and the drug has its best chance of helping you. If dry eyes dominate, the drug is unlikely to replace what you already use, so keep up artificial tears and other eye treatments your eye doctor recommends. Starting hydroxychloroquine is not a reason to drop saliva substitutes, eye drops or other dryness care, because any dryness benefit is small and slow.

Why Doctors Still Prescribe It First

The drug measurably calms the immune system. It lowered the immune system’s overactive alarm signals in the blood of people with Sjögren’s.¹⁹ It also lowered ESR, or sed rate, a blood marker of inflammation your report may list, along with antibody levels.²⁰ In everyday practice, people on it more often saw low platelets, low blood protein and high sed rate improve.²¹ Those blood changes didn’t translate into feeling better in the main trial.²²

They still matter. Sjögren’s isn’t only a gland problem; the same immune activity can affect joints, nerves, lungs, kidneys and blood counts in some people. Your doctor may track these numbers across visits, looking at the trend. That is one reason a doctor might encourage you to continue even when symptom change is mild, though it is not proof that the drug is protecting your organs.

The US Sjögren’s Foundation guidelines name it the first medicine to try for joint and muscle pain.²³ Other studies showed pain and inflammation improved, and it has a favorable safety record.²⁴

Doctors are also weighing what else is available. Very few medicines for Sjögren’s have strong evidence behind them, so there is rarely a proven option to choose instead. Stronger immune-suppressing drugs bring more risk of side effects and need closer monitoring, which isn’t worth it for mild or joint-focused disease.

How Long It Takes to Work

Hydroxychloroquine is slow-acting, often taking 2 to 3 months to show effects. In one study, improvement appeared by 8 weeks and held at a year.²⁵ The saliva benefit in another study was seen after 30 weeks.²⁶

To judge fairly, rate your pain, fatigue and dryness once a week on a 0 to 10 scale, and jot down flares and anything else that changed, such as stress, poor sleep or a new medicine. Bring the log to your follow-up a few months in. Take the pill every day as prescribed, because a slow-acting drug can’t be fairly judged if doses are often missed.

Doses usually stay at or below 5 mg per kg of body weight.²⁷ Don’t raise your dose yourself, since the dose is linked to eye risk.

Who Seems to Respond Best

Researchers are looking for markers that predict response. In a small study, people with a certain immune marker in their salivary glands more often reported good symptom control on the drug.²⁸ Certain blood proteins helped tell apart people who responded to a drug combination including hydroxychloroquine.²⁹ These tests aren’t part of routine care yet. People with joint pain and signs of inflammation on blood tests are often the ones offered it first, since that is where the evidence is best.

Safety and Eye Checks

The drug’s key serious risk is damage to the retina, the light-sensing layer at the back of the eye.³⁰ That risk is low during the first 5 to 10 years of use.³¹ It rises with longer use, with doses above 5 mg per kg of real body weight, with kidney problems and with the breast cancer drug tamoxifen.³² After more than 20 years, damage can occur even at the safe dose.³³

Screening catches damage early. Get a baseline eye exam within the first year, then yearly exams after 5 years, or yearly from the start if you have risk factors. Tell your eye doctor you take hydroxychloroquine so they use the right tests.

Sjögren’s dryness is felt on the surface of the eye as grit, burning or a sandy feeling, and it often improves with drops. Retina damage is usually painless in its early stages and affects central vision, so you may not notice anything wrong for a long time. Only an eye exam with specific retinal tests can detect drug damage.

Nausea or an upset stomach is the most common early complaint, and taking the pill with food often eases it. Skin rash or skin darkening can occur and is worth mentioning to your doctor. Low blood sugar is a rare risk, so know the signs, such as shakiness, sweating or sudden confusion, and report them. Report vision changes such as trouble reading, missing letters or blind spots promptly instead of waiting for your next scheduled exam.

Options If It Doesn’t Help Enough

Combinations look stronger. Adding leflunomide to hydroxychloroquine reduced disease activity more than a dummy pill in a controlled trial.³⁴ A follow-up trial confirmed the combination worked for active disease and was generally well tolerated.³⁵ Another drug, iguratimod, lowered symptom scores more than hydroxychloroquine in one comparison.³⁶

The leflunomide trials tested people with active disease, so the results may not apply if your Sjögren’s is mild or mostly dryness. The iguratimod comparison was a single study, so it is a promising sign rather than a settled answer.

At your rheumatology visit, say which symptom bothers you most. Ask whether your dryness needs its own treatment, such as saliva stimulants, because hydroxychloroquine is unlikely to resolve it. If your disease seems active, ask whether a combination like those tested in trials suits you. Don’t stop hydroxychloroquine without discussing it first, since symptoms such as eye surface damage may return.³⁷