Different hayfever tablets contain different active ingredients. Remedies containing Chlorphenamine (Piriton), Promethazine (Phenergan) or Diphenhydramine (Benadryl) can be sold over the counter when their sale is reviewed by a pharmacist which is why we ask customers a few questions before they are able to purchase them. Over the counter hayfever tablets are not inherently "stronger" than those available on general sale. Tablets containing low doses of Cetirizine and Loratadine can be bought without pharmaceutical review and you may find that these are more effective for your particular symptoms. Read more about choosing the right hayfever treatment.