[Experimental investigation on intrapulmonary and tracheobronchial distribution of ampicillin after administration of a beta-lactam antibiotic, bacampicillin].

Bacampicillin (BAPC) is a esterified derivative of ampicillin (ABPC) developed recently by the Swedish company. In present investigation we measured the concentration of ABPC in plasma, lung and tracheobronchial tissues from normal, pleuritis and pneumonitis male albino rabbits after an oral administration of BAPC. In these 3 groups plasma level of ABPC reached the maximum at 30-50 minutes after oral administration, then showed a gradual decrease. The decaying curves of pleuritis and pneumonitis groups were steeper than that of control group. Plasma level of ABPC in pneumonitis group at the maximum value was about 1/2 comparing with that in control and pleuritis groups. ABPC levels of tracheobronchial tissues in pleuritis and pneumonitis groups were higher than that in control group at 60 minutes after oral administration of BAPC. On the other hand, tissue level of ABPC in control group was higher than that in pleuritis and pneumonitis groups at 120 minutes after oral administration of BAPC. ABPC level of lung tissues (L1 and L5) in control group was higher than that in pleuritis and pneumonitis groups at 60 minutes after oral administration of BAPC, on the other hand ABPC level of L3 in control group was lower than that in pleuritis and pneumonitis groups. ABPC levels of lung tissues (L1 - L5) at 120 minutes after oral administration of BAPC were higher in control group comparing with that in pleuritis and pneumonitis groups.