Musk revealed on Wednesday on social media platform X that he is using Eli Lilly's Mounjaro for weight loss. Musk posted a photo of himself dressed as Santa Claus standing next to a Christmas tree, captioned 'Ozempic Santa Claus.' He later confirmed in several posts that he is indeed using a drug similar to Ozempic for weight loss. He explained, 'Strictly speaking, I am using Mounjaro, but that name doesn’t sound as interesting.' Ozempic is a diabetes drug from Novo Nordisk, while Wegovy is the company's weight loss medication, both of which share the same active ingredient, semaglutide. Mounjaro is a diabetes medication launched by Eli Lilly, with the same active ingredient as the company's weight loss drug Zepbound, which is tirzepatide. Musk revealed that he initially tried using Ozempic for weight loss because high doses of the drug made him 'fart and burp like Barney from The Simpsons.' 'The side effects of Mounjaro seem to be fewer, and it works better,' he added.