The only problem with going OTC rather than prescription is that you're restricted as to how many tablets you can buy at a time. I'm supposed to take (and do) 6 paracetamol every day and at 60p/32, it's cheaper to buy them at Sainsbury's than to get them prescribed (actually, I get free prescriptions but I don't want to burden the NHS with the cost) but I can only buy a couple of boxes at a time. Luckily, we're at Sainsbury's a couple of times per week so can keep stocks up by both getting the maximum allowance each visit. Not sure if it's possible to get a letter from a doctor to get more per visit - being otherwise healthy, I don't want to take up an appointment just for that, although I might ask the nurse when I go in for a quick consultation next week.