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