Boertjie, in a genuine survival situation a pain killer strong enough to knock you out can become a literal killer ie you may not wake up. All very well having it with you but still lends itself to abuse. If all you want is instant pain relief from burns ask the doctor for a spray can of lidocaine skin anasthetic spray. Always remember that pain is your bodys way of telling you that it has been injured and removing the pain can result in more damage to the injured part. Work on increasing your pain threshold.<br>Regards