Hair loss from hydroxychloroquine is a recognized side effect that typically shows up as gradual, diffuse thinning rather than bald patches. The good news: it’s almost always reversible. The hair follicles aren’t destroyed, and most people see regrowth once the issue is addressed, whether that means adjusting the medication, treating a nutritional deficiency, or simply waiting for the shedding cycle to end.
The tricky part is figuring out whether hydroxychloroquine is actually the cause. If you’re taking it for lupus or rheumatoid arthritis, the underlying disease itself can trigger hair loss. So can low iron, thyroid problems, or the stress of a recent flare. Sorting out the real culprit is the first step toward stopping the shedding.
Why Hydroxychloroquine Causes Hair Thinning
Hydroxychloroquine most commonly triggers a type of shedding called telogen effluvium. Normally, only about 5 to 15 percent of your scalp hair is in its resting (telogen) phase at any time. When a medication disrupts the hair cycle, a much larger percentage of follicles shift into that resting phase simultaneously. You won’t notice anything right away. The shedding starts one to six months later, with an average delay of about three months, when new hairs begin pushing the resting ones out.
This means the hair loss you’re seeing now may have been triggered by a dosage change or new prescription from months ago. It also means the process is self-limiting: once the trigger is removed or the body adjusts, the follicles cycle back to normal growth. The American College of Rheumatology lists “hair changes” among hydroxychloroquine’s known side effects, though it’s less common than issues like stomach upset or eye-related concerns.
Is It the Drug or the Disease?
This is the most important question to answer before making any changes. Lupus causes hair loss in up to half of the people it affects, and ironically, hydroxychloroquine is one of the primary treatments for lupus-related hair loss. Stopping the medication without knowing the true cause could make things worse if your underlying condition flares.
There’s no single test that definitively proves a medication caused your hair loss. Dermatologists use a combination of approaches to narrow it down:
- Detailed drug history: Your doctor will look at every medication change in the three months before shedding started, including dosage adjustments and over-the-counter supplements.
- Hair pull test: Gently pulling a small cluster of hairs from base to tip. Normally one or two hairs come out. In active shedding conditions, 10 to 15 hairs may release. The pulled hairs can be examined under a microscope to determine whether they’re in the resting or growth phase.
- Blood work: Iron studies, thyroid function, and a complete blood count help rule out other common causes of diffuse thinning.
- Scalp biopsy: Occasionally needed to rule out scarring alopecia, which lupus can cause and which requires different treatment entirely.
The only way to truly confirm drug-induced hair loss is to stop the suspected medication for at least three months and observe whether regrowth occurs. But that decision should be made carefully with your prescribing doctor, since hydroxychloroquine plays a critical role in managing autoimmune disease.
Check Your Iron and Vitamin D Levels
Before attributing everything to hydroxychloroquine, ask your doctor to check your ferritin (stored iron) and vitamin D levels. Research published in the National Library of Medicine found that people with diffuse hair loss had significantly lower ferritin levels than healthy controls: an average of about 15 ng/ml compared to 25 ng/ml. Both values technically fall within the “normal” lab range of 10 to 204 ng/ml, which is why iron deficiency often goes undetected in standard screening.
In one study of 96 women with diffuse hair loss, 18 had iron deficiency without actual anemia. After treatment with oral iron supplements, all 18 reported that their hair loss stopped during follow-up. This is worth emphasizing: your hemoglobin can look perfectly fine on a blood test while your iron stores are too low to support healthy hair growth. Vitamin D deficiency follows a similar pattern and was also significantly lower in hair loss patients. Correcting these deficiencies won’t counteract a true drug reaction, but if low iron or vitamin D is contributing to the problem alongside hydroxychloroquine, supplementation can make a meaningful difference.
Practical Steps to Reduce Shedding
If you and your doctor determine that hydroxychloroquine is likely contributing to your hair loss, several options exist depending on how essential the medication is for your condition.
Dose Adjustment
Sometimes a lower dose still controls the underlying disease while reducing side effects. This is especially worth discussing if your hair loss started after a dosage increase. Your rheumatologist can evaluate whether a reduction is safe for your specific situation.
Switching Medications
If the hair loss is severe and clearly linked to hydroxychloroquine, your doctor may consider an alternative immunosuppressive or disease-modifying agent. This is a case-by-case decision that depends on your diagnosis, disease activity, and what other medications you’ve already tried.
Waiting It Out
Telogen effluvium from medications often resolves on its own as your body adjusts, even if you continue taking the drug. If your disease is well controlled and the hair loss is mild to moderate, your doctor may recommend staying the course for a few more months to see if the shedding slows naturally.
Topical Treatments
Over-the-counter minoxidil (the active ingredient in Rogaine) is sometimes used to support regrowth during drug-induced shedding. It works by extending the growth phase of the hair cycle and increasing blood flow to the follicles. It won’t address the root cause, but it can help speed up the recovery process. Results typically take three to six months to become visible, and the treatment needs to be consistent.
Protecting Your Hair During Recovery
While you’re waiting for regrowth, minimizing physical stress on your hair can prevent additional breakage and make the thinning less noticeable. Avoid tight hairstyles that pull on the roots, limit heat styling, and skip chemical treatments like bleaching or perming. Use a wide-tooth comb on wet hair instead of a brush.
A protein-rich diet supports hair growth from the inside. Hair is made almost entirely of a protein called keratin, and inadequate protein intake can slow regrowth even after the triggering factor is resolved. Eggs, fish, legumes, and lean meats all provide the building blocks your follicles need. If you’ve been on a restricted diet due to autoimmune symptoms or medication side effects, a multivitamin with biotin, zinc, and B vitamins can help fill gaps, though supplements alone won’t override a drug-related cause.
Timeline for Regrowth
If hydroxychloroquine is discontinued and it was the true cause, most people notice shedding slowing within two to three months. Visible regrowth typically begins around three to six months after the trigger is removed. Full recovery to your previous hair density can take six to twelve months or longer, since hair only grows about half an inch per month.
If the medication is continued at the same dose and the shedding was simply your body’s initial reaction, the timeline is less predictable. Some people see improvement within a few months as their system adjusts. Others experience ongoing low-grade thinning for as long as they take the drug. Tracking your shedding with photos taken in consistent lighting each month gives you and your doctor objective data to guide decisions, rather than relying on the anxiety of what you see in the shower drain day to day.