# Substitution Therapy Outpatient Clinic, Psychiatry Center Keywords: - [substitution therapy](< /en/search?q=substitution therapy >) - [addiction psychiatry](< /en/search?q=addiction psychiatry >) The Substitution Therapy Outpatient Clinic of the Psychiatry Center is an outpatient unit of HUS's Addiction Psychiatry, where we treat patients whose substitution therapy requires special expertise in specialist medical care. In the Substitution Therapy Outpatient Clinic, we will treat you if your substitution treatment requires special expertise in specialist medical care. In such a case, you have some severe somatic or psychiatric illness or disorder in addition to an opioid dependence. At the Substitution Therapy Outpatient Clinic, we also conduct assessments of the need for substitution therapy. ## [ Maisa Portal (opens in new window, links to another website) ](https://www.maisa.fi/maisa/Authentication/Login?lang=britishenglish) MAISA.FI You can use our online services by signing in to the Maisa Portal. Once your treatment with us begins, you will receive information on the services you can access in Maisa. These include appointment booking and preliminary information forms, for example. Click here to go to Maisa’s sign-in page  ## [ Patient Guide ](/en/patient/patient-guide) The Patient Guide site answer the most common questions you might have before, during, and after treatment. See Patient Guide site here  ## Contact information and opening hours #### Visiting address Psychiatry Center Välskärinkatu 6 Helsinki #### Postal address P.O. Box 590 00029 HUS ### Nurses [ Phone, Nurses: 040 353 3834​ ]() ### Office [ Phone, Office: 09 471 63636 ]()telephone hours: Mon–Thu 8:00–15:00 Fri 8:00–14:00 ## Find us here ### [ Psychiatry Center ](/en/patient/hospitals-and-other-units/psychiatry-center)  ## Unit's services ### [ Addiction psychiatry ](/en/patient/treatments-and-examinations/addiction-psychiatry) Updated: 16.01.2025 Print this page