I've tried looking to see what the situation is with importing that quantity of medication (especially unaccompanied) but can't find any references online. You should check this, maybe even make an enquiry via a reputable shipper (FedEx???).

Also, make sure you don't get hit for import duties. My wife left her cell phone in Singapore. We had it sent back to London and the shipper was intent on charging us for various import duties (that were close to the value of the phone) even though we owned the thing in the first place. Again, agree the situation with the shipping company.