What is Melanotan II, the drug that consumers are urged to avoid? Experts warn that using Melanotan II, a nasal spray tan, is not as harmless as it first appears, urging Aussies striving to be beautifully bronzed to stick to fake tan., , #spraytan #melanotan Viral 'Barbie drug' for tanning can cause brain swelling and even cancer, experts warn Melanotan II Results (With Before And After Pictures) The Tanning Drug