Yes, a patient has the right to discontinue treatment with a psychiatrist or any other healthcare provider without informing them beforehand. Patients are not legally obligated to provide a reason for ending the therapeutic relationship, and they can make the decision to leave at any time.
However, it is generally considered more courteous and beneficial to inform the psychiatrist of the decision to discontinue treatment. This allows the psychiatrist to have a proper closure and potentially provide recommendations or referrals for alternative care if necessary. It also ensures that the patient's medical records are updated accordingly.
Keep in mind that if the patient is under any legal commitment or court order to receive psychiatric treatment, abruptly stopping treatment without following the appropriate procedures could have legal implications. Otherwise, the decision to inform the psychiatrist is ultimately up to the patient, and they can choose what they feel is most comfortable and appropriate for their situation.