Thermazene

THERMAZENE- silver sulfadiazine cream
COVIDIEN INC.

DESCRIPTION

Thermazene (silver sulfadiazine) Cream, 1% is a soft, water dispersible cream containing silver sulfadiazine in micronized form for topical application. Each gram of Thermazene contains 10mg of micronized silver sulfadiazine.

This active agent has the following structural formula:

Thermazene contains 1% w/w silver sulfadiazine. The vehicle in which the active ingredient is dispersed consists of water, stearyl alcohol NF, white petrolatum USP, polyoxyl 40 stearate NF, propylene glycol USP, isopropyl myristate NF, and sorbitan monooleate NF with 0.3% methylparaben NF as a preservative.

CLINICAL PHARMACOLOGY

Silver sulfadiazine has broad antimicrobial activity. It is bactericidal for many gram-negative and gram-positive bacteria as well as being effective against yeast. Results from in vitro testing are listed below.

Sufficient data have been obtained to demonstrate that silver sulfadiazine will inhibit bacteria that are resistant to other antimicrobial agents and that the compound is superior to sulfadiazine.

Studies utilizing radioactive micronized silver sulfadiazine, electron microscopy, and biochemical techniques have revealed that the mechanism of action of silver sulfadiazine on bacteria differs from silver nitrate and sodium sulfadiazine. Silver sulfadiazine acts only on the cell wall to produce its bactericidal effect.

Results of in Vitro Testing With Silver Sulfadiazine Cream, 1% Concentration of Silver Sulfadiazine Number of Sensitive Strains / Total Number of Strains Tested

Genus and Species	50 µg/mL	100 µg/mL
Pseudomonas aeruginosa	130/130	130/130
Xanthomonas (Pseudomonas) maltophilia	7/7	7/7
Enterobacter species	48/50	50/50
Enterobacter cloacae	24/24	24/24
Klebsiella species	53/54	54/54
Escherichia coli	63/63	63/63
Serratia species	27/28	28/28
Proteus mirabilis	53/53	53/53
Morganella morganii	10/10	10/10
Providencia rettgeri	2/2	2/2
Proteus vulgaris	2/2	2/2
Providencia species	1/1	1/1
Citrobacter species	10/10	10/10
Acinetobacter calcoaceticus	10/11	11/11
Stahylococcus aureus	100/101	101/101
Staphylococcus epidermidis	51/51	51/51
B-Hemolytic streptococcus	4/4	4/4
Enterococcus species	52/53	53/53
Corynebacterium diphtheriae	2/2	2/2
Clostridium perfringens	0/2	2/2
Candida albicans	43/50	50/50

Silver sulfadiazine is not a carbonic anhydrase inhibitor and may be useful in situations where such agents are contraindicated.

INDICATIONS AND USAGE

Thermazene Cream is a topical antimicrobial drug indicated as an adjunct for the prevention and treatment of wound sepsis in patients with second and third degree burns.