I had an interesting discussion last night with Google about exactly this! The temperature in the house was 29 and I could hardly breathe.. It advised against keeping my Digoxin, Furosemide and Bisoprolol in the fridge and suggested I find a low, dark cupboard where the temp was below 25. I couldn't find one and told "him" so. He then suggested putting the packets in a plastic container wrapped in a towel and placing the parcel on a tiled floor. This I did, along with my daily pill box which I'd already filled for this week. They were noticeably cool this morning.
Google also suggested I find an air conditioned place to be instead of at home and suggested the local library, the local Co-Op ( I was to wander slowly up and down the aisles!) or the local church! I didn't do any of those, but today we drove to the tip of Anglesey, where the temp was about 10C cooler, to do our shopping. It was bliss!
Thankfully the temp here this evening has dropped considerably, and isn't forecast to go that high again but I hope the pill storage tip helps someone!