In the TPI procedure, a healthcare professional inserts a small needle into the patient’s trigger point. With the injection, the trigger point is made inactive, and the pain is alleviated. Usually, a brief course of treatment will result in sustained relief. Injections are given in a doctor’s office and typically take just a few minutes. Several sites may be injected in one visit. If a patient has an allergy to a particular drug, a dry-needle technique (involving no medications) can be used.