Clinical trials are research studies that look at new ways to prevent, detect, or treat diseases and conditions, including OCD. During clinical trials, investigated treatments might be new drugs or new combinations of drugs, new surgical procedures or devices, or new ways to use existing treatments. The goal of clinical trials is to determine if a new test or treatment works and is safe. Although individual participants may benefit from being part of a clinical trial, participants should be aware that the primary purpose of a clinical trial is to gain new scientific knowledge so that others may be better helped in the future.
Local commissioners and providers of healthcare have a responsibility to enable the guideline to be applied when individual professionals and people using services wish to use it. They should do so in the context of local and national priorities for funding and developing services, and in light of their duties to have due regard to the need to eliminate unlawful discrimination, to advance equality of opportunity and to reduce health inequalities. Nothing in this guideline should be interpreted in a way that would be inconsistent with complying with those duties.
Some common compulsions include hand washing, cleaning, checking things (., locks on doors), repeating actions (., turning on and off switches), ordering items in a certain way, and requesting reassurance.  Compulsions are different from tics (such as touching, tapping, rubbing or blinking)  and stereotyped movements (such as head banging, body rocking or self-biting), which usually aren't as complex and aren't precipitated by obsessions.  It can sometimes be difficult to tell the difference between compulsions and complex tics.  About 10% to 40% of individuals with OCD also have a lifetime tic disorder.