Hair shedding after starting a GLP-1 medication

Also searched as: OzempicWegovysemaglutideweight-loss injections

Hair loss is listed in the Wegovy (semaglutide 2.4 mg) prescribing information in about 3% of adults versus 1% on placebo, and the label says these reports were associated with weight reduction; weight loss is a recognised trigger of telogen effluvium, which typically shows a few months after the trigger.

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The timeline

Stage	When (typically)	What's happening
Trigger	Rapid weight loss	AAD lists losing 20 pounds or more as a common trigger of excessive shedding (telogen effluvium). [American]
Onset	Commonly about 2–4 months later	DermNet describes increased hair fall noticed 2 to 4 months after a triggering event. [DermNet]
Settling	Typically over 6–9 months	Shedding commonly tapers back to normal over 6–9 months in most cases, if the trigger is no longer active. [DermNet]

Key facts

In pooled adult trials of Wegovy 2.4 mg, hair loss was reported in 3.3% of patients (4% of women, 0.9% of men) versus 1% on placebo. [U.S.]
The label states hair-loss reports were associated with weight reduction. [U.S.]

Normal vs. warning signs

Commonly normal

Diffuse shedding across the whole scalp rather than patches
Shed hairs with a small white bulb at the root (club hairs)
Shedding that began a couple of months after weight loss sped up
A fine fringe of short new hairs along the hairline

Warning signs — get checked

Patches or bald spots
Scalp pain, redness, burning or scaling
Loss of eyebrows, eyelashes or body hair
Shedding continuing well beyond about 9 months
Feeling generally unwell, very tired, or unable to eat enough

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What may help

Talk to your prescriber before changing any dose — never stop on your own.
Ask whether checking iron, B12, folate or thyroid is appropriate; DermNet advises correcting any such abnormality.
Eat a nutritious diet with enough protein, as DermNet recommends for telogen effluvium.
Handle hair gently while shedding is active.

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Related triggers

Medications

Isotretinoin (Accutane)

Frequently asked questions

Does Ozempic or Wegovy cause hair loss?

Hair loss is listed as an adverse reaction in the Wegovy label (about 3% vs 1% on placebo), and the label links these reports with weight reduction. Ozempic contains the same active ingredient, semaglutide.

When does shedding after weight loss start?

Telogen effluvium is typically noticed about 2 to 4 months after the trigger, according to DermNet.

Should I stop my medication?

No change should be made without your prescriber. AAD notes that serious side effects can occur if you stop a treatment suddenly.

Will it grow back?

Telogen effluvium is usually self-correcting and commonly tapers over 6–9 months once the trigger settles, though recovery can be incomplete for some people.

Sources

U.S. FDA / DailyMed. WEGOVY (semaglutide) prescribing information — Adverse reactions: Hair loss
American Academy of Dermatology. Do you have hair loss or hair shedding?
DermNet (Chang F-L, Oakley A, 2019). Telogen effluvium