What are the maximum amount of 30mg codeine phosphate tablets i can take in a day?

Personal evaluation: That depends upon your weight, medical conditions, health and perhaps other medications that you are already taking. Only a doctor who knows your complete medical history and is actually treating you can properly answer that question. I hope you aren't self medicating yourself.

Max Dose: If it is pure Codeine (not tylenol (acetaminophen) with codeine)....Then 360 mg per day is the max. In any case you should not exceed the dose your doctor prescribed