OCD Treatment Options: Medication, ERP Therapy, or Both?

The two first-line treatments at a glance

ERP is a specific kind of cognitive behavioral therapy (CBT): with a therapist, you gradually face the situations, thoughts or images that set off your obsessions and practice not doing the compulsion that usually follows. Medication for OCD means a serotonin reuptake inhibitor, usually an SSRI first. The APA practice guideline calls both “safe and effective first-line treatments” and says the choice depends on your symptoms, other conditions, whether ERP is available to you, past treatment and preference.

Medication: SSRIs and clomipramine

According to NIMH, the medications most often used for OCD are antidepressants that act on serotonin, mainly selective serotonin reuptake inhibitors (SSRIs). The APA guideline recommends the five with FDA approval for OCD, listed below, and prefers an SSRI for a first trial because SSRIs have “a less troublesome side-effect profile” than clomipramine. It notes that all SSRIs, including citalopram and escitalopram (not FDA-approved for OCD), appear about equally effective, though one person may respond to one and not another.

• Dose plans differ from depression. NIMH notes that OCD may require higher doses than are typically used for depression; the APA guideline adds that higher doses call for close monitoring, including for serotonin syndrome. Your prescriber sets the plan; this page gives no doses on purpose.
• Side effects. NIMH lists headaches, nausea and trouble sleeping. Report them rather than quietly stopping; see common side effects and fixes.
• Boxed warning. Each of these labels warns that antidepressants increased the risk of suicidal thoughts and behaviors in children, teens and young adults in short-term studies; new or worsening thoughts of suicide need a call to the prescriber right away. See the boxed warning for teens.
• Pregnancy and breastfeeding. The guideline treats starting or stopping a medication then as a risk-benefit decision made with you, ideally with your obstetrician.

How long a fair medication trial takes, and why OCD needs longer

The APA guideline says most people do not see substantial improvement until 4 to 6 weeks after starting, and some who eventually respond see little change for as long as 10 to 12 weeks. NIMH gives the same picture: 8 to 12 weeks before symptoms begin to improve.

Time alone is not the whole test. Improvement in OCD tends to come slowly and often only after the dose has been raised and held, so the guideline’s checkpoint counts both: about 8 to 12 weeks of treatment, including 4 to 6 weeks at the highest dose you tolerate comfortably. Only then does it suggest deciding with your clinician whether to change course. A medication stopped at week 4, or never raised beyond a starting dose, has not had a fair trial.

1. The first weeks: follow-ups focus on side effects and adjusting the dose step by step. The guideline suggests visits a few days to two weeks apart after a new medication, depending on how you are doing.
2. The middle weeks: change is often small and uneven. Noting your rituals, time lost and avoidance once a week shows progress you might miss day to day.
3. The checkpoint: around weeks 8 to 12, you and your prescriber decide whether to continue, adjust or add something.
4. If it works: the guideline suggests continuing for 1 to 2 years before considering a slow, supervised taper, because relapse after stopping is a real risk.

ERP: what the therapy involves

NIMH describes ERP as a specific type of CBT that gradually exposes you, in a safe setting, to situations that trigger an obsession while you hold off on the usual compulsion. A person afraid of contamination might touch something they consider dirty and not wash; someone who checks might lock the door once and walk away. Anxiety rises at first, which is why some people drop out early, but NIMH notes that compulsions decrease for most people who keep going, and that ERP reduces compulsions even in people who do not respond well to medication.

The APA guideline recommends CBT built mainly on ERP because it has the best evidence of any psychotherapy for OCD. In practice:

• Sessions at least weekly, usually 13 to 20 for most people; more frequent sessions are an option.
• Practice between sessions is part of the treatment.
• Mental rituals, such as counting, praying or reviewing conversations to feel safer, are treated too.
• Family members often get pulled in by giving repeated reassurance or doing checks; bringing them into the plan can help.
• After a good response, booster sessions (monthly for 3 to 6 months in the guideline) help keep the gains.

ERP by video has growing support: a 2024 federal evidence review (AHRQ) found telehealth ERP effective for children and teens, and the APA’s 2013 update described encouraging early studies of ERP by phone and internet for adults.

Medication, ERP or both: how to decide

There is no single right order. NIMH notes that for many people CBT-type therapy can be as effective as medication, while others do best with both. The APA guideline’s reasons to lean one way:

• ERP first: you prefer not to take medication, can commit to weekly sessions and practice, and are not so depressed or anxious that exposures feel impossible right now.
• Medication first: you cannot do ERP at the moment, or a medication worked for you before.
• Both: one treatment helped only partly; you also have depression or another condition these medications treat; or OCD is severe enough that medication may need to bring symptoms down before ERP is possible.
• Hoping to stop medication someday: ERP alongside medication may lower the chance of relapse when medication is later stopped.

For children and teens, the American Academy of Child and Adolescent Psychiatry recommends CBT with ERP first for mild to moderate OCD and ERP plus an SSRI for some, especially with more severe symptoms, as summarized in the 2024 AHRQ review. That review found ERP, alone or with an SSRI, probably more effective than an SSRI alone.

Not sure whether what you are dealing with is OCD at all? Start with intrusive thoughts: what they are and when they point to OCD.

When the first option doesn’t help enough

The APA guideline is frank that first treatments rarely remove every OCD symptom. When a good response has not come after a full trial (13 to 20 weeks of weekly ERP, about 3 weeks of daily ERP, or 8 to 12 weeks of medication with 4 to 6 weeks at the highest comfortable dose), you and your clinician decide together whether and how to change treatment.

First, the guideline suggests looking for what gets in the way: another condition such as depression, missed doses or skipped ERP practice (often because of side effects or cost), heavy stress, family members accommodating the OCD, or a plan that was never tolerable enough to complete. If none of these explains it, the guideline and its 2013 update describe options chosen case by case:

• adding ERP to medication, or medication to ERP
• making ERP more intensive, for example moving from weekly to more frequent sessions
• switching to a different SSRI or to clomipramine
• adding a second medication, including certain antipsychotic medications, which have their own risks to weigh

For severe OCD that has not improved after several of these steps, the guideline mentions intensive residential treatment or partial hospitalization, which Willow & Stone does not provide. NIMH also describes transcranial magnetic stimulation (TMS), which the FDA approved for severe OCD that has not responded to other treatments; Willow & Stone does not offer TMS and refers out for it. If your OCD needs that level of care, an outpatient telehealth practice is not the right fit on its own, and we will say so.

Whatever the next step, do not stop or change a medication without talking to your prescriber.

How to find an ERP therapist

ERP is delivered by a licensed therapist (such as a psychologist, counselor, social worker or marriage and family therapist) trained in it. A therapist who treats anxiety does not necessarily offer ERP, so ask directly. NIMH suggests starting with a health care provider, who can refer you to a mental health professional experienced with OCD. Questions to ask:

• Do you use exposure and response prevention for OCD, and how much of your work is with OCD?
• How often would we meet, and about how many sessions do you expect?
• How do you work with mental rituals and reassurance-seeking?
• Do you offer sessions by video, and how do you run exposures that way?
• With my written permission, will you share progress with my prescriber?

At Willow & Stone, Dr. Stacey Forbes, DNP, APRN, PMHNP-BC, a board-certified psychiatric-mental health nurse practitioner, provides OCD evaluation and medication management. Ask us whether ERP is available through the practice or by referral. If you already have an ERP therapist, tell us at your evaluation so your medication plan and therapy fit together.

Where Willow & Stone fits

Dr. Forbes sees preteens (from age 10), teens and adults by secure video in the seven states where she is licensed. OCD care starts with a 90-minute integrative psychiatric evaluation; if medication is part of the plan, medication management follow-ups (25 to 50 minutes) carry the trial through its checkpoints. First appointments are typically available within 1 to 2 days; see fees and insurance by state.

We are the wrong first call if you are in crisis or in danger right now (call or text 988, or call 911), if your OCD is so severe that you need a residential or hospital-based program, or if you want TMS, which we refer out.

Common Questions

Sources

• American Psychiatric Association: Practice Guideline for the Treatment of Patients With Obsessive-Compulsive Disorder (2007)
• APA Guideline Watch (March 2013): Practice Guideline for the Treatment of Patients With OCD
• NIMH: Obsessive-Compulsive Disorder: When Unwanted Thoughts or Repetitive Behaviors Take Over
• AHRQ Comparative Effectiveness Review: Diagnosis and Management of Obsessive Compulsive Disorders in Children (2024), PubMed 39836793
• FDA label (DailyMed): Prozac (fluoxetine)
• FDA label (DailyMed): Zoloft (sertraline)
• FDA label (DailyMed): fluvoxamine maleate extended-release capsules
• FDA label (DailyMed): Paxil (paroxetine)
• FDA label (DailyMed): Anafranil (clomipramine)

This article is general education, not a diagnosis or advice for your situation. Only a clinician who has evaluated you can diagnose a condition or recommend treatment. Do not start, stop, or change a medication without talking to the clinician who prescribes it.