is it legal for my x to put my daughter on sike meds with out my premisson when we have jont custody

I have dealt with this many times before. Your ex is not allowed to make medical decisions without your agreement, unless the divorce decrees allows for it.  If the divorce decree does not allow it, then you should contact the doctor and notify him/her that you have joint legal custody and these decisions should not be made without.  You also discuss with the doctor why the medication is needed.  You may also file a motion for contempt against your ex for violating legal custody.  You should consider taking your daughter for a second opinion with your notice to your ex and see if the prior diagnosis and course of treatment are valid.  The court will want to know if there is a valid medical reason for the psych medication.  Best wishes.