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Sponsored| Name | Address | City |
|---|---|---|
| Hollywood Hills Recovery | 6221 Holly Mont Dr | Los Angeles |
| Aegis Treatment Centers Pomona | 1050 N. Garey Avenue | Pomona |
| Aegis Treatment Centers Pasadena | 1450 N. Lake Avenue # 150 | Pasadena |
| MedMark Treatment Centers Los Angeles | 11900 Avalon Blvd Ste 200 | Los Angeles |
| Aegis Medical Systems, Inc. – Wilmington | 909 N. Avalon Boulevard | Wilmington |
| Aegis Treatment Centers West Covina | 1825 E. Thelborn Street | West Covina |
| Western Pacific Rehabilitation (Norwalk) | 11902 E. Rosecrans Blvd. | Norwalk |
| BAART Programs Beverly | 1926 West Beverly Blvd. | Los Angeles |
| BAART Programs La Puente | 15229 E. Amar Road | La Puente |
| Aegis Treatment Centers La Mirada | 14240 E. Imperial Highway | La Mirada |
| Aegis Treatment Centers Hesperia | 11776 Mariposa Road # 103 | Hesperia |
| Tavarua Medical Rehabilitation Services | 474 S Citrus Ave | Azusa |
| Children’s Hospital Los Angeles | 4650 Sunset Blvd. | Los Angeles |
| Dr. Jorge D. Minor, MD | 1245 Wilshire Boulevard Suite 403 | Los Angeles |
| Aspire Counseling Services Victorville | 12571 Hesperia Rd | Victoville |
| Tavarua Health Services | 8207 Whittier Blvd. | Pico Rivera |
| Downtown LA VA Clinic | 351 East Temple St. | Los Angeles |
| Western Pacific Medical Clinic | 218 East Commonwealth Ave. | Fullerton |
| Escondido Comprehensive Treatment Center | 161 North Date St | Escondido |
| California Institution for Women | 16756 Chino-Corona Rd. | Corona |
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Starting opioid use disorder treatment in Ontario
Ontario sits at the western end of San Bernardino County, on the Los Angeles County line and at the crossroads of the region’s freeways and its airport. For a person with opioid use disorder, that location widens the options: opioid treatment programs and office-based prescribers operate across the west valley, and communities just over the county line add more. All three FDA-approved medications, methadone, buprenorphine, and naltrexone, are used throughout the area. Start with the listings on this page, or call the helpline shown here to figure out your first step.
The three medications and the two ways to get them
Opioid use disorder has three FDA-approved medications, and they are not obtained the same way. Methadone for opioid use disorder is dispensed only through a licensed opioid treatment program, never a retail pharmacy, so early treatment means visiting a clinic. Buprenorphine, including Suboxone and other buprenorphine-naloxone products, can be prescribed in a doctor’s office and filled at a pharmacy, or provided at a clinic, and a long-acting monthly injection is available. Naltrexone, including the Vivitrol injection, can be prescribed by any licensed clinician, but only after a person has been off opioids long enough to avoid a bad reaction.
Behind the listings are two settings. An opioid treatment program dispenses on-site and can start methadone or buprenorphine. Office-based opioid treatment means a prescriber writes for buprenorphine or naltrexone that you fill at a pharmacy, which can be more convenient if a daily clinic visit does not fit your schedule. For a side-by-side look at the two most common medications, see how methadone and Suboxone differ.
What the first visit looks like
Treatment starts with an assessment, where a clinician reviews your history and health and helps you choose a medication. Many programs can begin that day, and some offer same-day or next-day dosing, which matters most when withdrawal is pushing you to act. Bring identification and insurance details if you have them, but do not let missing paperwork stop you from calling.
If you have been using fentanyl, the timing of a first buprenorphine dose needs care. Taking it too early can set off precipitated withdrawal, a fast and severe return of symptoms, so a clinician waits for the right moment. To see how care unfolds from that first visit, read our overview of how opioid use disorder treatment works.
Take-home medication, telehealth, and where the rules stand
Ongoing treatment is more flexible than it used to be. A 2024 federal update lets stable patients receive take-home methadone, up to a 28-day supply, with the program judging readiness, and it allowed treatment to begin by telehealth and permitted mobile medication units. Buprenorphine can be started by telehealth, including by phone in many situations, under rules that hold through 2026 and are still being finalized. Methadone for opioid use disorder is still dispensed through an opioid treatment program. If you are moving here or transferring your care, keeping treatment uninterrupted is the goal; our page on staying in methadone treatment for the long term explains how transfers usually work.
Coverage and cost
Medi-Cal, California’s Medicaid program, covers all three medications for opioid use disorder through Drug Medi-Cal, and a 2022 state law bars prior authorization for those medications under Medi-Cal and state-regulated plans. In San Bernardino County it is delivered through the Drug Medi-Cal Organized Delivery System, run locally by the county Department of Behavioral Health, with Inland Empire Health Plan (IEHP) as the main Medi-Cal managed care plan. Private insurance and Medicare are also widely accepted, and self-pay or sliding-scale options exist at some programs. Because Ontario sits on the county line, a provider can also help you understand which nearby options your plan covers. Ask before your first visit so cost is settled up front.
How opioids have affected the county
Ontario shares in a countywide fentanyl trend that has begun to turn. County data record fentanyl-related deaths rising from 6 in 2016 to 278 in 2024, with the drug-induced death rate at 26.1 per 100,000 in 2023, near the statewide 27.3 (San Bernardino County Community Indicators, 2024), followed by an early decline as naloxone and treatment expanded. Behind each figure is a person and a family, and the same data explain why getting into care matters: SAMHSA finds medication treatment roughly halves the risk of death from opioid use disorder. If you want to understand what makes opioids so difficult to stop without help, our overview of opioid use disorder and its treatment lays it out.
Treatment when you work, and your privacy
Ontario is a working city, with many residents in warehouses, logistics, and shift jobs where taking time off is hard. Treatment is built to fit around work: office-based buprenorphine can mean a pharmacy pickup rather than a daily clinic visit, and stable methadone patients can earn take-home doses. Your treatment is protected health information, and being in treatment for opioid use disorder may be protected under privacy and disability law, so in most cases it is not something you have to disclose to an employer. Our page on methadone treatment and employment covers what to know about work and privacy. If a schedule is your main barrier, tell a provider; they can often match you to a setting that fits.
Naloxone saves lives
Naloxone reverses an opioid overdose, and it is worth keeping nearby whether or not you are in treatment. It is sold over the counter as Narcan, available at pharmacies, and free through community programs stocked by California’s Naloxone Distribution Project. The state’s Good Samaritan law shields people who administer it or call for help during an overdose. If you are around anyone who uses opioids, learning the signs and carrying naloxone is a simple step; our guide to responding to an opioid overdose walks through it.
Questions we hear from Ontario
Do I have to leave Ontario to find treatment?
Not usually. Opioid treatment programs and office-based prescribers serve the west valley, and because Ontario sits on the county line, nearby communities add more options. Use the listings on this page to see what is closest, and the helpline can help if the nearest fit is just over the line.
Can I stay employed while in treatment?
Yes. Many people work full time while in treatment. Office-based buprenorphine can mean a pharmacy pickup instead of daily visits, and stable methadone patients can qualify for take-home doses that fit a work schedule.
What does methadone do?
Methadone is a long-acting medication that eases withdrawal and cravings without the highs and crashes of opioid use, which lets people stabilize and function. It is dispensed through an opioid treatment program and dosed to each person.
Do I have to be in withdrawal to start?
For buprenorphine, a clinician usually waits for early withdrawal so the first dose does not trigger precipitated withdrawal, especially after fentanyl. Methadone can often be started sooner. Your provider will guide the timing.
Can my family be involved?
Yes, if you want them to be. Family support is linked to better outcomes, and many programs welcome loved ones in the process. You can find more in our questions and answers section.
About this page
Last reviewed August 2026.
Sources:
- San Bernardino County, Community Indicators Report, substance use, 2024: indicators.sbcounty.gov
- California Department of Health Care Services, Drug Medi-Cal Organized Delivery System: dhcs.ca.gov
- California Department of Health Care Services, Naloxone Distribution Project: dhcs.ca.gov
- California Department of Public Health, Naloxone and Good Samaritan Law: cdph.ca.gov
- National Health Law Program, “Substance Use Disorders in Medi-Cal: An Overview,” 2024: healthlaw.org
- SAMHSA, 42 CFR Part 8 final rule (2024) and DEA/HHS telemedicine flexibilities (through Dec 31, 2026): samhsa.gov
Methadone Centers is an informational directory and is not a treatment provider. We do not provide medical advice, diagnosis, or treatment; decisions about medication and care should be made with a licensed clinician.
The helpline on this page is a sponsored resource. Calls may be answered by or routed to a paid advertiser or partner. Using it is not required to access any provider listed on this page.