Zoloft dosage for kidshave been taking zoloft for 15 mths, step-by-step gone up to 300mg, and have been on that dosage for 10 mths. disorder, or social anxiety disorder is typically 25 mg daily, healthcare providers often increase that dose to 50 mg daily. . . . The recommended dosage of Zoloft for children . . . Children 13-17 years: The usual starting dose is 50 mg once a day. . . . Children . . In the in United States it is sold under the brand name Zoloft . . . . . . . have skilled most sy... more