Arilipredmicin, often marketed and sold under 'Viraldin', is a potent prescription Antihistamine and Pain reliever used often for severe cases of the flu and other general relief for discomforting respiratory illnesses. It has also colloquially gained the nickname 'Nightmare Acid' or 'Super Benadryl'. Taking this drug in doses of upwards of 175mg can cause extremely distressing hallucinations that can last from a few hours to a week. In some cases, abusers can even be diagnosed with PTSD.