How can i have a drug addict and alcoholic committed?

Differences by state: Each state has its own procedure, so you would need to check with the magistrate in your area. Generally for commitment, the person needs to be both mentally ill and dangerous to self or others. Alcohol and drug abuse may or may not meet these criteria. In some states, "gravely disabled" (judgment is so impaired that the person is incapable of accepting treatment) substitutes for mentally ill.

Yes: Only for a short stay. That person has to be willing to stay longer if they want further help. The max you will be able to commit is only for 72 hours.

DIFFICULT: State rules may vary but in ohio you cannot commit a patient with primary diagnosis of substance abuse , only with a diagnosis of mental illness. Very tough to make someone get treatment for addictions. Even legal interventions do not guarantee abstinence. Try a formal intervention with family and friends.