Tablets and capsules in blister packs must be wrapped in bubble wrap and boxed for shipping. Ordinary mailers may not provide sufficient protection and the meds run the risk of popping out of their packs when other packages fell or stacked over them.
For bottled pills, keep the medicines from rattling about by filling the tops with cotton. This will also prevent the pills from getting chipped or broken into pieces. Make sure to keep bottle caps are tightly sealed.
As much as possible, send the prescription in the original dispensing container with appropriate labels. You could also include a copy of the prescription in case someone from the post office questions the contents of the package. Properly label and documented medicines are much less likely to be questioned than unmarked pills.
Follow these tips when shipping medicines which require refrigeration.