ISSN:
1432-1041
Keywords:
trimethoprim
;
sulfamethopyrazine
;
saliva levels
;
serum levels
;
saliva pH
Source:
Springer Online Journal Archives 1860-2000
Topics:
Chemistry and Pharmacology
,
Medicine
Notes:
Summary A combination of trimethoprim (TMP) and sulfamethopyrazine (SMP) was administered to six healthy volunteers for 8 days, according to the proposed therapeutic repeated dose schedule. The weak base TMP (pKa=7.3) and the weak acid SMP (pKa=6.1) were measured simultaneously in serum and saliva, both under normal conditions and after stimulation of saliva flow. The flow of saliva was stimulated by chewing plastic material in order to obtain saliva at a pH close to the normal plasma pH of 7.4. This procedure excluded pH-dependent distribution effects. Under these experimental conditions a highly significant correlation was observed between the serum and saliva concentrations of both drugs, with very small inter- and intraindividual variations. Substantial agreement was found between the saliva:serum concentration ratio and the fractions of both drugs not bound to plasma protein. Some discrepancies were noted, probably due to minor shifts in saliva pH during the collection period.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00607146
