Victoza® and hair loss

What the product information says

Section 6.2 of the US label lists alopecia, alongside cutaneous amyloidosis, under skin reactions reported after approval. The label explains that such reports come voluntarily from a population of unknown size, so it is not possible to estimate a rate or confirm that the medicine caused them. ^[1] Hair loss is not among the reactions in Table 1. ^[1] The European summary of product characteristics and leaflet do not mention hair loss for Victoza®. ^[2] Canada’s monograph has one trial table with an alopecia row, and does not include it in its lists of less common or postmarketing reactions. ^[3]

The same molecule at the higher 3 mg dose, sold as Saxenda® for weight management, also lists alopecia only among postmarketing reports, not in its trial table. ^[4]

How much weight changes on Victoza®

Weight matters here because rapid weight loss is one of the leading explanations researchers give for shedding on GLP-1 medicines. ^[5] The Victoza® trials show modest changes: in a 26-week comparison with sitagliptin, average weight fell by 2.7 kg on 1.2 mg and 3.3 kg on 1.8 mg, from an average of 94 kg, against 0.8 kg on sitagliptin. ^[1] Against exenatide, both groups lost about 3 kg. ^[1] Victoza® is approved to improve blood sugar and to lower cardiovascular risk in type 2 diabetes, not for weight loss. ^[1]

That does not rule hair loss out, since any significant illness, stress or diet change can trigger shedding. ^[6] But it may help explain why liraglutide appears less often in the hair loss literature than the higher-dose weekly medicines. ^[5]

What the research found

A 2026 systematic review in Science Progress screened 133 studies and included 24 that looked at hair loss with GLP-1 medicines. Semaglutide and tirzepatide showed the highest rates and the most frequent signals in safety-report databases; fewer studies assessed liraglutide, and those generally found lower reported risk. ^[5] The reviewers named telogen effluvium and pattern hair loss as the main types described, noted that women seemed more affected, and pointed to rapid weight loss as a possible contributor, particularly for telogen effluvium. ^[5] They also stressed that causation and timing have not been established and that large prospective trials are still needed. ^[5]

In short: there is no Victoza®-specific study of hair loss, and the review evidence for liraglutide is thin rather than reassuring or alarming.

Why shedding happens after a body stress

Cleveland Clinic describes three phases of the hair cycle: growth, transition and rest. In telogen effluvium a stress or change to the body pushes many growing hairs into the resting phase early, and they fall out a few months later. ^[7] It notes that the shedding often shows up two to three months after the trigger, is usually concentrated on the top of the head, and that people often have already recovered from the illness or stress and do not connect the two. ^[7] MedlinePlus adds that hair may come out in handfuls when washing or brushing and that shedding fades over several months. ^[6]

Which part of this applies to someone on Victoza® is not known; no study has shown that liraglutide itself acts on hair follicles.

Other causes worth checking

MedlinePlus and Cleveland Clinic list triggers that are common in people with type 2 diabetes and heart disease. Thyroid disease, anaemia, major illness or surgery, high fever, severe infection and strict diets low in protein can all cause shedding. ^[6][7] Some medicines can too, including beta-blockers and calcium channel blockers used for blood pressure and heart conditions, certain antidepressants, retinoids and anti-inflammatory painkillers such as ibuprofen. ^[6][7] In the LEADER trial, 92.4% of participants took blood pressure medicines other than diuretics, although the label does not say which kinds. ^[1]

Inherited pattern thinning, alopecia areata (round bald patches), scalp infections and tight hairstyles are other causes with a different pattern. ^[6]

What helps, according to the sources

MedlinePlus says hair lost to illness, fever or medicine usually regrows once the cause has passed, with no treatment needed, and that hairstyles, hats or hair pieces can cover thinning in the meantime. ^[6] Cleveland Clinic says most telogen effluvium settles once the trigger is dealt with and lists over-the-counter scalp treatments and supplements among the options. ^[7] Ask a pharmacist or your prescriber before starting any product, particularly with diabetes and heart medicines.

Because diet is a known trigger, the Victoza® label’s appetite row is relevant too: decreased appetite was reported by 10% on 1.2 mg and 9% on 1.8 mg against 1% on placebo. ^[1] If nausea or a small appetite has changed how you eat, mention it alongside the hair loss.

Victoza® and Saxenda® are registered trademarks of Novo Nordisk A/S. PepLabo is not affiliated with or endorsed by Novo Nordisk A/S.