Country: South Africa
Language: English
Source: South African Health Products Regulatory Authority (SAHPRA)
Lennon
DOXYCLIN (CAPSULES) SCHEDULING STATUS: S4 PROPRIETARY NAME (and dosage form): DOXYCLIN (CAPSULES) COMPOSITION: Each capsule contains: Doxycycline Hydrochloride 115 mg (equivalent to 100 mg Doxycycline). PHARMACOLOGICAL CLASSIFICATION: A 20.1.1 Broad and Medium Spectrum Antibiotics PHARMACOLOGICAL ACTION: Doxyclin (Doxycycline) exhibits the following distinct advantages over other tetracycline compounds: 1. The almost complete oral absorption and prolonged half-life results in the therapeutic efficacy of small clinical doses, when administered only once daily. This rapid absorption in the intestinal wall, and wide-spread diffusion in the tissues, is due to the considerable liposolubility and lipophilicity possessed by Doxyclin (Doxycycline). Multiple dose studies have demonstrated that there is a cumulative effect with increments in blood levels on each successive day of administration. The absorption is not significantly impaired by the administration of food and milk. CLINICAL STUDIES: One third of the normal dose of tetracycline (100 mg) of Doxyclin (Doxycycline) gives peak plasma levels of 1,78 mg/mL after 2 hours, this being greater than the minimum capable of inhibiting most bacterial strains. This level is maintained for at least 24 hours, thus permitting single daily doses of Doxyclin which are lower than other tetracyclines. The 4 hour peak with demethylchlortetracycline (DMTC) is 1,99 mg/mL and DMTC has a plasma half-life of 12,7 hours compared to 15,1 hours with doxycycline. The relative high plasma levels and prolonged half-life may be due to the lower renal clearance of doxycycline (15,95 mL/min compared to 36,49 mL/min with DMTC). The decrease in renal clearance is not from a decrease in the quantity filtered by the glomeruli, but from a higher tub Read the complete document