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