Flomoxef (FMOX, 6315-S), a new intravenous cephem antibiotics, was administered to a total of 11 cases with their ages ranging from 7 years and 4 months to 10 years and 10 months. Among them, two were administered with (FMOX at) a dose level of 10 mg/kg, three each with 20 mg/kg and 40 mg/kg using one shot intravenous injection, and the remaining 3 with 40 mg/kg by intravenous drip infusion over 30 minutes. Plasma concentrations, urine concentrations and urinary recovery rates were determined.
The clinical efficacy of FMOX was evaluated in 2 cases with tonsillitis, 45 with acute pneumonia, 10 with urinary tract infections, 2 with purulent lymphadenitis, and 2 with abscess, a total of 61 cases. Of these cases, one case of pneumonia in which a side effect occurred was excluded from the evaluation because the treatment was interrupted short of the required period. In the remaining 60 cases, the mean daily dose was 79.3 mg/kg in 3 or 4 divided doses and, except one case treated by 30-minute intravenous drip infusion, all cases were treated by one shot intravenous injection for a mean period of 6 days.
Bacteriological effects of FMOX, its side effects and influences on laboratory test values were also investigated.
1. Maximum plasma concentrations after one shot intravenous injections of FMOX occurred at 5 minutes after administration regardless of dose levels (10 mg/kg in 2 cases, 20 mg/kg in 3 and 40 mg/kg in 3). Mean peak values obtained upon the 3 different dose levels were 62.5, 103.1 and 244.7 μg/ml, respectively. Mean plasma half-lives were 0.670, 0.915 and 0.595 hour, and mean AUCs were 33.0, 65.2 and 133.1μg·hr/ml, respectively. Thus, a positive dose-response relation ship was found among the 3 doses.
2. Plasma concentrations after 30-minute intravenous drip infusions of FMOX at 40 mg/kg always reached a peak at 30 minutes after the initiation of infusion, i.e. at the completion of infusion, and the mean value for 3 administrations was 151.0 μg/ml. The mean half-life was 0.973 hour and the mean AUC was 149.1μg·hr/ml.
3. Maximum concentrations in urine after one shot intravenous injections of FMOX were always obtained in 0-2 hours after administration regardless of dose levels (10 mg/kg, 2 cases, 20 mg/kg, 3 cases and at 40 mg/kg, 3 cases) and mean values for the 3 dose levels were 2,570, 4,410 and 6,290 μg/ml, respectively. Thus, urine concentrations were also dose-dependent. Because of a failure to collect a urine sample, a 6-hour analysis was not done in 1 of the 3 cases to which FMOX was given at 40 mg/kg. In the remaining cases, namely, 2 at 10 mg/kg, 3 at 20 mg/kg and 2 at 40 mg/kg, mean 6-hour recovery rates were 92.2, 72.0 and 77.9%, respectively.
4. Maximum urine concentrations of FMOX after 30-minute intravenous drip infusions in 3 cases given 40 mg/kg occurred invariably during 0-2 hours after administration and the mean value was 7,083 μg/ml. The mean urinary recovery during a 6-hour period after the completion infusion was 77.3%.
5. Clinical efficacy of FMOX was evaluated in 60 cases consist of 5 categories of bacterial infections. The drug was effective or very effective against all cases of pneumonia which accounted for the majority of illness. In the total population, a very high efficacy rate of 98.3% was obtained.
6. Bacteriological effect was evaluated in 22 cases. The elimination rate was very high, 95.5%.
7. Among the 61 ch ildren treated with FMOX, urticaria developed in 2 cases (3.3%) and the causal relation to the drug was considered “probable” in 1 case and “possible” in the other. With regard to laboratory test values, eosinophilia was found in 3 out of 50 cases (6.0%) examined for this parameter in the peripheral blood, and the causal relation of the abnormality to this drug was considered “definite” in 1 case and “possible” in the other 2 cases.
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