Total premenstrual forgetfulness alert, or that's my excuse. I'm away on a work trip, and brought an empty blister pack of my tranexamic acid for heavy periods with me instead of enough tablets to see me through the next few days. 
It looks like it is possible to buy the equivalent (Cyklo-f) OTC at Boots if the pharmacist thinks it is appropriate. I don't have my GP prescription with me, but assume I don't need a prescription to buy over the counter anyway. What does the pharmacist need to know / see? I don't want to waste a trip if I can help it
Thank you!