There are programs available in or near Hico which service both methadone and buprenorphine clients only, medications which are administered in what is called opioid maintenance therapy. Methadone is a full opioid agonist just like heroin, and buprenorphine is a partial agonist, which means the same neural receptors which make a person feel high from heroin or prescription pain killers are stimulated by these two drugs so therefore an opioid addicted client will ideally no longer engage in drug seeking behavior and won't experience withdrawal symptoms. There are dangers with drug interactions, side effects, and even overdose with both buprenorphine and methadone, which is why they are heavily controlled and can only be prescribed in a clinical setting.
Buprenorphine and methadone clients take these medications daily so they don't experience cravings, withdrawal, etc. but ideally at a dose which isn't at the same time making them feel high. Euphoria is possible at a high dosage, more significantly with methadone than buprenorphine. At programs that treat methadone and buprenorphine clients only, actual rehabilitation activities and therapies are limited beyond managing the medication and the main treatment goal is to handle the physical symptoms of their dependence. Some programs do deliver a limited amount of counseling and therapy as auxiliary services, and this is encouraged.