Obsessive compulsive and related disorders
OCD involves intrusive, unwanted thoughts and repetitive behaviors or mental rituals performed to ease the distress, taking up time and peace of mind.
Obsessions are persistent intrusive thoughts, images, or urges that feel alien and distressing. Compulsions are the repetitive behaviors or mental acts done to neutralize them: checking, washing, counting, seeking reassurance. The cycle can consume hours a day, and many people suffer quietly out of shame.
OCD is well understood and treatable. OCD involves loops between brain regions that generate doubt and urge, and SSRIs, often at higher doses than used for depression, help quiet those loops by increasing serotonin activity. That makes intrusive thoughts less sticky and rituals feel less urgent. Exposure and response prevention therapy works alongside it by teaching the brain that the feared outcome does not arrive when the ritual is skipped. With the right approach, most people see meaningful improvement.
Research and further reading
A few key papers behind how this condition is understood and treated today. Links open the abstract on PubMed, a free public database from the U.S. National Library of Medicine.
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Obsessive Compulsive Disorder: Advances in Diagnosis and Treatment
Hirschtritt et al. · JAMA · 2017
This major review found cognitive behavioral therapy with or without an SSRI remains the preferred first approach, with growing support for added options such as antipsychotic augmentation and neuromodulation when first line treatments are not enough.
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Skapinakis et al. · The Lancet Psychiatry · 2016
In an analysis comparing OCD treatments directly and indirectly, combining therapy and medication looked most effective, with therapy alone also outperforming medication alone.
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Stein et al. · Nature Reviews Disease Primers · 2019
A comprehensive overview of OCD covering its biology and treatment, noting that exposure based therapy and SSRIs are effective but that many people still have residual symptoms and need further treatment.
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Soomro et al. · Cochrane Database of Systematic Reviews · 2008
Across 17 trials with 3,097 adults, SSRIs as a group reduced OCD symptoms more than placebo in the short term.
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Greist et al. · International Clinical Psychopharmacology · 1995
In 325 adults, sertraline improved OCD symptoms more than placebo over 12 weeks, and responders kept their improvement during 40 more weeks of treatment.
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