PMID: 3236216Aug 1, 1988

Role of deacetylation in the nonlinear pharmacokinetics of sulfamonomethoxine in pigs

Journal of Pharmacobio-dynamics
M ShimodaT Hayama


The role of deacetylation in the pharmacokinetics of sulfamonomethoxine (SMM) in pigs was studied using 6 Goettingen minipigs and a pig from a commercial breed. The rapid decrease of plasma concentration of the parent compound followed by the rapid increase of plasma concentration of the deacetylated metabolite, SMM, was observed after an i.v. injection of N4-acetylsulfamonomethoxine (AcSMM; 10 mg/kg). The concentration of the metabolite, SMM, was greater than that of AcSMM and after reaching peak, both compounds decreased in parallel on a semilogarithmic graph. On the other hand, the acetylated compound of SMM (AcSMM) appeared in the plasma and reached peak after an i.v. injection of SMM. After reaching the peak, both SMM and AcSMM decreased in parallel. The slopes of the terminal phases of SMM and AcSMM after both injections showed no significant difference. After the i.v. injection of a high dose of SMM (100 mg/kg), a nonlinear pharmacokinetics profile with capacity limited elimination type of SMM was observed. The concentration of plasma AcSMM increased rapidly and the parallel decrease of SMM and AcSMM was observed in both nonlinear and linear phases, while the renal excretion of AcSMM was saturated in the nonlinear phase....Continue Reading

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