Doxycycline belongs to the group of tetracyclines and acts bacteriostatic
against many Gram-positive and Gram-negative. The action of
doxycycline is based on inhibition of bacterial protein synthesis.
Gentamicin sulphate belongs to the group of aminoglycosides and acts
bactericidal against mainly Gram-negative bacteria. The bactericidal
action is based on inhibition of bacterial protein synthesis as well.
Administered orally, gentamicin is poorly resorbed and, therefore
performs its action predominantly in the gastrointestinal tract.