When it comes to treating psychological disorders such as attention deficit hyperactivity disorder (ADHD) or post-traumatic stress disorder (PTSD), it is increasingly common for doctors to prescribe for their patients a variety of drugs. From Ritalin to Valium, these drugs can be highly addictive and can also have negative side effects that range from the relatively benign, such as a loss of appetite, to the extreme, such as severe atrial fibrillation.