Melanotan II is the product that's been dubbed the "Barbie drug" on social media, and promises to give users a tan without the sun but it can have serious side effects including, in rare cases, IMB issues warning over tanning injections at salons or bought on internet The Irish Times Melanotan is trending again. As a dermatologist, I strongly need to tell you , Its an unapproved injectable peptide, and were seeing:, nausea and flushing, darkening of existing moles, TikTokers using genetic disorder drug for the side effects of tanning, weight loss