Decreased sertraline 50 mg to 25 mg for a week then discontinued last night, will i have side effects?

Maybe: For long-term treated patients, wfsbp guidelines recommend tapering over 4-6 months. If intolerable withdrawal symptoms occur following a dose reduction, consider resuming the previously prescribed dose and/or decrease dose at a more gradual rate. Side effects are too many to list. Be sure to monitor for any abnormal behavior, thoughts or symptoms.