What is Melanotan II the drug that the TGA urges consumers to avoid? Viral 'Barbie drug' for tanning can cause brain swelling and even cancer, experts warn Melanotan 2 Nasals Effective Alternative to Injections Doctors warn against viral nasal spray tanning trend Viral 'Barbie drug' for tanning can cause brain swelling and even cancer, experts warn Avoid nasal tanning sprays or nasal tanners entirely. These products promise an all over tan without sun exposure but they are unregulated, can be unsafe, and contain potentially risky substances like Melanotan 2.