Girls, what did you take for your children who were prescribed glycine…

Girls, what did you take for your children who were prescribed glycine? We can't find it in drops and we can't order it. The doctor prescribed glycine Forte Evalar. There is a dosage of 300 mg and at the pharmacy they said that this is too much. They gave us a pack of 100 mg. I bought both and then, but how to take them? The doctor with us, I don't want to call her again.