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