Paracetamol - antipyretic and analgesic - The recommended adult single dose of paracetamol is two standard 500 mg tablets. Research shows that the common threshold for liver damage to occur from a single paracetamol overdose is 15 gms (30 tablets) although standard hospital guidelines allow an extra safety margin and assume liver damage could occur at a single overdose of 24 standard tablets or 150 mg/kg body weight, whichever is the smaller. The overdose threshold may be lowered in a person taking certain prescription medicines, or a person who is an alcoholic or is seriously undernourished. If the overdose is spread over a period of time the threshold may be higher, as the initial paracetamol dose is effectively metabolised. (The recommended maximum dose in a 24 hour period is 4g or 8 tablets).