Currently on 100mg Zoloft (sertraline) daily. Is this enough and how long does it usually take before it works for anxiety and ocd?

Uusally 4-6 wks. Usually the effect pf the med takes 4-6 weeks to show. Being under the care of a psychiatrist will allow the mental health condition to be closely evaluated while the meds are taking effect. Frequently the dosage has be adjusted or actual changes in the medication should be done.