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  • Title: [Fundamental and clinical studies of sustained release cephalexin (L-Keflex) in the field of oral surgery (author's transl)].
    Author: Morihana T, Ueda K, Muraoka M, Tsushima T, Kodama M, Nagata K, Nakao K, Shimada K.
    Journal: Jpn J Antibiot; 1980 Apr; 33(4):514-21. PubMed ID: 6997536.
    Abstract:
    L-Keflex is a newly manufactured cephalexin product in order to maintain effective blood level of the drug for a long period of time. The results of the fundamental and clinical studies are as follows: 1. Mean blood levels of the drug after its single oral dose of 1 g in fasting in 22 cases before operations were: 7.19 mcg/ml at 2 hours (peak), 4.35 mcg/ml at 4 hours, 4.21 mcg/ml at 6 hours, 2.47 mcg/ml at 8 hours and 1.81 mcg/ml at 12 hours, respectively. Existence of the drug in blood was observed for a long period of time. 2. The distribution into the tissues of L-Keflex was generally good. The tissue levels in 19 of 22 samples ranged from 1.30 to 18.0 mcg/g, but 3 samples did not detect the drug in the tissues. Tissue level/blood level ratios were 0.19 approximately 2.67. 3. Half of 30 cases with mild dental infections was treated with a daily dose of 1 g with clinical response of 60.0%, and the other half with 2 g was 78.6% in clinical response. The overall efficacy rate was 69.0%. 4. As a side effect of the drug, only one of 52 cases (fundamental 22 cases, clinical 30 cases) complained of edema on both eyelids. No. abnormality was observed in blood finding, hepatic and/or renal function. From the above results, it is considered that L-Keflex is an effective antibiotic product in infections in the field of oral surgery. Also, L-Keflex has an advantage in that its administration frequence (b.i.d) is less than that of regular cephalexin (q.i.d.).
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