*Antibiotics* Understanding *synergism & antagonism* is very important for field Vets # for effective results in treating bacterial infections *Synergistic effect* # means a situation where the *combined effect of two Antibiotics is much greater* than the sum of effect of each Antibiotic given alone For Ex : 1 + 1 = >> 2 ( More than 2 ) *_Antagonism is the opposite of Synergism_* Ex : 1+1 = << 1 ( less than 1 ) ................................................... Thumb Rule : *Penicillins should not be given along with Tetracyclines* *Penicillins shall be given along with Aminoglycosides* for synergistic effect