This gets asked more than almost anything else and deserves a straight answer. The regulatory reviews to date have not established that GLP-1 medication causes depression or suicidal thoughts. That is not the same as saying nothing can change, and any change is worth raising.
Regulators have reviewed reports of mood changes and suicidal thoughts in people taking GLP-1 medication and have not to date established a causal link. Monitoring continues, as it should for any widely used medicine.
Separately from causation, a great deal changes when someone starts this treatment: eating patterns, social routines built around food, body image, and how other people talk to you. Those affect mood in their own right.
And where someone already lives with depression or anxiety, that does not rule treatment out. It means it is part of the picture and gets attention rather than being ignored. Worth reading next: Common side effects, Physician-supervised care and Stopping medication.
Straight answer
What to do
Handling mood changes during treatment
Say so at the start
If you live with depression or anxiety, that belongs in the history. It changes what gets monitored, not whether you are treated.
Raise changes early
A shift in mood, motivation or sleep is worth mentioning at the next review rather than waiting to see whether it passes.
Check the obvious things
Very low intake, dehydration and poor sleep all affect mood independently, and all are common in the first weeks.
Escalate when needed
Thoughts of self-harm are not something to raise at a scheduled review. Contact a clinician or an urgent service the same day.
The wider picture
Why weight loss itself affects how people feel
Food is social and habitual. When appetite falls sharply, meals with other people, celebrations and ordinary routines all shift, and that adjustment is real regardless of medication.
How other people respond changes too, sometimes in ways that are unwelcome. It is a normal thing to find difficult and a reasonable thing to raise at an appointment. The detail sits in Weight loss for women, Nutrition on a GLP-1 and Personalized plan.
Eating and social routineChanges
How others respondChanges
Both of themWorth raising
Side effects
Other side effect topics
The common list, nausea, red flags and interactions.
What the evidence says, existing conditions, and when to escalate.
Regulatory reviews to date have not established a causal link between GLP-1 medication and depression or suicidal thoughts. Monitoring continues, and any change in mood is still worth reporting.
Generally yes. It belongs in your history so that it is monitored properly, and so that anything that changes during treatment is noticed rather than missed.
Several ordinary things could explain it: sharply reduced intake, dehydration, poor sleep, or the social adjustment that comes with eating differently. All are worth checking before assuming it is the medication.
Contact a clinician or an urgent service the same day rather than waiting for a scheduled appointment. If you are in immediate danger, use your local emergency number.
Raise it first rather than stopping unilaterally, unless you are in crisis. The decision about continuing is made with the full picture, including everything else that has changed.
It belongs in your history at the start and at any review afterwards. If you are struggling now, speak to a clinician or an urgent service today rather than waiting.
