Understanding and Managing OCD with Exposure and Response Prevention (ERP)
Mina Boazak, MD

This guide provides information about Obsessive-Compulsive Disorder (OCD) and explains how Exposure and Response Prevention (ERP), a highly effective therapy, can help you manage its symptoms. It includes steps for creating your own ERP plan and examples to get you started.
Important Note: This guide is for educational purposes and is not a substitute for diagnosis or treatment by a qualified mental health professional specializing in OCD. ERP is most effective when done with the guidance of a trained therapist.
What is Obsessive-Compulsive Disorder (OCD)?
OCD involves two main components:
- Obsessions: Unwanted, intrusive, and persistent thoughts, images, or urges that cause significant anxiety or distress. Common themes include contamination, harm to self or others, unwanted sexual or religious thoughts, and the need for symmetry or exactness. These are not just excessive worries about real-life problems.
- Compulsions (Rituals): Repetitive behaviors (like washing, checking, ordering) or mental acts (like praying, counting, repeating words silently) that a person feels driven to perform in response to an obsession or according to rigid rules. The goal of compulsions is usually to prevent a feared event or reduce the distress caused by obsessions, but this relief is only temporary and reinforces the OCD cycle.
The cycle looks like this: Obsession -> Anxiety -> Compulsion -> Temporary Relief -> Reinforcement
How Does ERP Work for OCD?
ERP is considered the gold standard treatment for OCD. It works by breaking the OCD cycle.
- Exposure: You intentionally and gradually confront the thoughts, images, objects, or situations that trigger your obsessions and cause anxiety.
- Response Prevention (RP): You make a conscious choice not to engage in the compulsive behavior (the ritual) you would normally perform to reduce your anxiety.
By doing exposures without performing the compulsions, you learn several important things:
- Your anxiety will naturally decrease over time, even without the ritual (habituation).
- The feared consequences you worry about are unlikely to happen.
- You can tolerate the anxiety and uncertainty.
This breaks the link between obsessions and compulsions, weakening OCD’s hold over time.

Key Principles of ERP for OCD
- Gradual: Start with exposures that cause moderate anxiety and work your way up.
- Prolonged: Stay in the exposure situation until your anxiety significantly decreases (often by about 50%).
- Repeated: Practice exposures regularly (often daily) until they no longer cause significant distress.
- Response Prevention is Crucial: The “RP” part is essential. Doing exposures without resisting compulsions is not effective ERP. This includes both physical rituals (checking, washing) and mental rituals (reviewing, praying, neutralizing thoughts).
Developing Your ERP Hierarchy (Ladder)
An ERP hierarchy lists triggers and exposure exercises, ranked from least to most anxiety-provoking, along with the specific compulsions to resist.

Steps to Create Your Hierarchy:
- Identify Obsessions & Compulsions: List your specific intrusive thoughts/fears and the rituals you perform in response. Be detailed. (e.g., Obsession: Fear of contamination from public doorknobs. Compulsion: Washing hands for 5 minutes).
- Brainstorm Exposure Exercises: Think of specific, concrete situations or actions that trigger your obsessions. (e.g., Touching a doorknob, thinking a “bad” thought without neutralizing it).
- Rate Your Anxiety (SUDS): Use the 0-100 SUDS scale (Subjective Units of Distress Scale) to rate the anxiety each exposure exercise would cause if you did not perform the compulsion.
- Identify Responses to Prevent: For each exposure, clearly state the specific compulsion(s) you will resist.
- Rank the Exercises: Arrange the exposure exercises from lowest SUDS rating to highest, creating manageable steps. Aim for 10-15 steps if possible.
Engaging in ERP Using Your Hierarchy
- Start Moderately: Begin with an item causing moderate anxiety (e.g., SUDS 40-50). Starting too low might not be challenging enough; starting too high can be overwhelming.
- Plan: Decide when, where, and how you’ll do the exposure and response prevention.
- Expose & Resist: Engage in the exposure exercise while actively resisting the urge to perform the compulsion(s).
- Lean into Anxiety: Acknowledge the anxiety and discomfort. Remind yourself this is OCD, and the feeling will pass. Focus on your goal.
- Stay With It: Remain in the situation or continue the exposure until your SUDS rating drops significantly. Don’t cut it short.
- Repeat: Practice the same step regularly until it consistently causes much less anxiety.
- Move Up: Once comfortable, move to the next step on your hierarchy.
- Be Patient & Persistent: ERP takes time, effort, and courage. Progress isn’t always linear. If you slip up with a compulsion, acknowledge it without judgment and recommit to response prevention next time.
Example ERP Hierarchies for OCD
Example 1: Contamination OCD
- Obsession: Fear of getting sick/contaminating others from germs on public surfaces.
- Compulsions: Excessive handwashing, avoiding public places, using barriers (sleeves/tissues) to touch things.
Exposure Exercise | Estimated SUDS (0-100) | Response Prevention (Compulsions to Resist) |
1. Touch own kitchen counter, wait 1 hr before washing | 40 | No immediate washing, no excessive washing later. |
2. Touch mailbox with bare hand, wait 1 hr | 50 | No washing for 1 hr, no sanitiser, no avoiding touching face. |
3. Touch public library book cover, wait 2 hrs | 60 | No washing for 2 hrs, no mental review of where germs spread. |
4. Touch shopping cart handle, wait 3 hrs | 70 | No washing for 3 hrs, no using sleeve/tissue. |
5. Touch public restroom doorknob (inside), wait 3 hrs | 80 | No washing for 3 hrs, no avoiding touching belongings. |
6. Touch floor of public bus, wait until next shower | 90 | No immediate washing, no excessive showering later. |
7. Touch inside of public trash can lid briefly | 95 | No washing until scheduled time, no reassurance seeking. |
Example 2: Checking OCD / Harm Fears
- Obsession: Fear of accidentally causing a fire or burglary due to negligence.
- Compulsions: Repeatedly checking stove, locks, appliances; seeking reassurance; mental review.
Exposure Exercise | Estimated SUDS (0-100) | Response Prevention (Compulsions to Resist) |
1. Lock front door once, walk away immediately | 45 | No re-checking lock, no asking family if it’s locked, no mental review. |
2. Turn off coffee maker once, leave kitchen | 55 | No visual re-check, no touching to confirm it’s off. |
3. Check stove knobs once after cooking, leave house for short walk | 65 | No second check, no asking others to check, no driving back to check. |
4. Lock front door once at night, go straight to bed | 75 | No getting up to check, no listening for noises, resist mental checking. |
5. Use toaster, unplug once, leave house for 1 hour | 85 | No re-checking plug/outlet, no reassurance seeking. |
6. Intentionally leave a less important appliance (e.g., lamp) on when leaving | 90 | Resist urge to go back/check, tolerate uncertainty about it being on. |
Example 3: Intrusive Thoughts (e.g., Religious/Moral Scrupulosity)
- Obsession: Fear of having blasphemous thoughts, fear of being secretly evil/sinful.
- Compulsions: Mental rituals (thought neutralizing, praying for forgiveness), reassurance seeking, avoiding religious symbols/places, mental review of actions.
Exposure Exercise | Estimated SUDS (0-100) | Response Prevention (Compulsions to Resist) |
1. Read neutral text containing words like “devil” or “hell” | 40 | No neutralizing thoughts, no praying for forgiveness immediately. |
2. Write down a mild “bad” thought (e.g., “I doubt God exists”) | 55 | No tearing up paper, no praying, no mental arguing with the thought. |
3. Look at a religious symbol while allowing intrusive thoughts to be present | 65 | No thought blocking, no replacing with “good” thoughts, no avoidance. |
4. Write a short script involving a feared blasphemous thought/image | 75 | No reassurance seeking, no mental review of morality, read script aloud. |
5. Listen to recording of self reading the script | 85 | No stopping recording, no mental rituals during/after listening. |
6. Attend religious service (if applicable) while allowing thoughts | 90 | No excessive praying for forgiveness, no leaving early, no mental checking. |
Blank ERP Hierarchy Template for OCD
My ERP Hierarchy for OCD Theme:
Step # | Exposure Exercise (Triggering situation/thought/object) | Estimated SUDS (0-100) | Response Prevention (Compulsion(s) to Resist) | Date Practiced | Peak SUDS During | SUDS After | Notes |
1 | |||||||
2 | |||||||
3 | |||||||
4 | |||||||
5 | |||||||
6 | |||||||
7 | |||||||
8 | |||||||
9 | |||||||
10 | |||||||
11 | |||||||
12 |
(Add more rows as needed)
Remember: ERP is challenging but incredibly effective for managing OCD. Working with a therapist trained in ERP for OCD is highly recommended to help you tailor your plan, navigate difficulties, and maximize your progress. Be patient and compassionate with yourself through this process.
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