My infant (age 8 months) is currently taking 30 mg of phenobarbital per day. We just increased this from 24 mg, which is the dose he was taking for several months prior. Since he started taking the increased dose on Wednesday, he has been noticeably drowsy but seems a little better today (Saturday). I really hate seeing my son so drowsy. Is this just a period of adjustment? How drowsy is too drowsy? Obviously I will contact his doctor if this persists, but I am just interested in hearing other people's experiences.