Tirzepatide (Mounjaro) is an FDA-approved weekly injection used for type 2 diabetes to lower blood sugar. Tirzepatide has also been shown in clinical trials to be useful for weight loss, although currently it is not an FDA-approved weight loss drug. Tirzepatide works by activating the GIP and GLP-1 receptors. Tirzepatide is only indicated for adults and should be used along with diet and exercise.