{TAIL ~ The dose ratio} of toxic to {HEAD ~ therpeutic effects} is the therapeutic index, and it can be expressed as the ratio, LD50/ED50 
{ TAIL ~ The dose ratio } of toxic to { HEAD ~ therpeutic effects } is the therapeutic index , and it can be expressed as the ratio , LD50 / ED50
TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH