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Basic information

  • Name:

  • Sulfamethoxazole

  • CAS No.:

  • 723-46-6

  • Formula:
  • C10H11N3O3S
  • Synonyms:
  • Sulfanilamide,N1-(5-methyl-3-isoxazolyl)- (6CI,8CI);3-(p-Aminobenzenesulfonamido)-5-methylisoxazole;3-Sulfanilamido-5-methylisoxazole;4-Amino-N-(5-methyl-3-isoxazolyl)benzenesulfonamide;4-Amino-N-(5-methyl-3-isoxazolyl)benzensulfonamide;5-Methyl-3-sulfanilamidoisoxazole;Gantanol;N1-(5-Methyl-3-isoxazolyl)sulfanilamide;NSC 147832;Radonil;Ro 4-2130;STX608;Sinomin;Sulfamethoxazol;

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Chemistry

IUPAC Name: 4-Amino-N-(5-methyl-1,2-oxazol-3-yl)benzenesulfonamide
Synonyms of Sulfamethoxazole (CAS NO.723-46-6): 3-(p-Aminophenylsulfonamido)-5-methylisoxazole ; 3-(para-Aminophenylsulphonamido)-5-methylisoxazole ; 3-Sulfanilamido-5-methylisoxazole ; 5-Methyl-3-sulfanilamidoisoxazole ; Benzenesulfonamide, 4-amino-N-(5-methyl-3-isoxazolyl)- ; Sulphamethylisoxazole
CAS NO: 723-46-6
Molecular Formula: C10H11N3O3S
Molecular Weight: 253.27
Molecular Structure:
EINECS: 211-963-3
H bond acceptors: 6
H bond donors: 3
Freely Rotating Bonds: 2
Polar Surface Area: 75.03 Å2
Index of Refraction: 1.641
Molar Refractivity: 62.45 cm3
Molar Volume: 173.1 cm3
Surface Tension: 70.9 dyne/cm
Density: 1.462 g/cm3
Flash Point: 245.4 °C
Enthalpy of Vaporization: 74.7 kJ/mol
Boiling Point: 482.1 °C at 760 mmHg
Vapour Pressure: 1.87E-09 mmHg at 25°C
Melting point: 166-169°C
Storage temp: 0-6°C
Stability: Stable, but light sensitive. Incompatible with strong oxidizing agents
Appearance: Crystals or white powder
Water solubility: Insoluble in water
Product Categories of Sulfamethoxazole (CAS NO.723-46-6): Antibiotics for Research and Experimental Use;Biochemistry;Sulfonamides (Antibiotics for Research and Experimental Use)

Uses

 Sulfamethoxazole (CAS NO.723-46-6) is a sulfonamide bacteriostatic antibiotic. Sulfamethoxazole is most often used as part of a synergistic combination with trimethoprim in a 5:1 ratio in co-trimoxazole. Besides it is commonly used to treat urinary tract infections and toxoplasmosis. In addition it can still be used as an alternative to amoxicillin-based antibiotics to treat sinusitis.

Toxicity Data With Reference

Organism Test Type Route Reported Dose (Normalized Dose) Effect Source
dog LDLo oral 3gm/kg (3000mg/kg)   "Experimental Chemotherapy, Volume II," Schnitzer, R.J., and F. Hawking, eds. Academic Press New York, 1964Vol. 2, Pg. 249, 1964.
mouse LD50 intraperitoneal 2300mg/kg (2300mg/kg) BEHAVIORAL: SOMNOLENCE (GENERAL DEPRESSED ACTIVITY)

BEHAVIORAL: CONVULSIONS OR EFFECT ON SEIZURE THRESHOLD

LUNGS, THORAX, OR RESPIRATION: DYSPNEA		 Chemotherapy Vol. 21, Pg. 175, 1973.
mouse LD50 intravenous 1460mg/kg (1460mg/kg)   "Modern Pharmaceuticals of Japan, V," Tokyo, Japan Pharmaceutical, Medical and Dental Supply Exporters' Assoc., 1975Vol. -, Pg. 105, 1975.
mouse LD50 oral 2300mg/kg (2300mg/kg)   Chemotherapia. Vol. 8, Pg. 63, 1964.
mouse LD50 subcutaneous > 5gm/kg (5000mg/kg)   Chemotherapy Vol. 21, Pg. 175, 1973.
mouse LD50 unreported 5gm/kg (5000mg/kg)   Chemotherapia. Vol. 6, Pg. 273, 1963.
rat LD50 intraperitoneal 2690mg/kg (2690mg/kg) BEHAVIORAL: SOMNOLENCE (GENERAL DEPRESSED ACTIVITY)

BEHAVIORAL: CONVULSIONS OR EFFECT ON SEIZURE THRESHOLD

LUNGS, THORAX, OR RESPIRATION: DYSPNEA		 Chemotherapy Vol. 21, Pg. 175, 1973.
rat LD50 oral 6200mg/kg (6200mg/kg)   Toxicology and Applied Pharmacology. Vol. 18, Pg. 185, 1971.
rat LD50 subcutaneous > 5gm/kg (5000mg/kg)   Chemotherapy Vol. 21, Pg. 175, 1973.
women TDLo oral 160mg/kg/10D- (160mg/kg) ENDOCRINE: HYPOGLYCEMIA Archives of Internal Medicine. Vol. 143, Pg. 827, 1983.

Safety Profile

Hazard Codes: IrritantXi,Xn
Risk Statements: 36/37/38-43-22
R22: Harmful if swallowed. 
R43: May cause sensitization by skin contact. 
R36/37/38: Irritating to eyes, respiratory system and skin.
Safety Statements: 26-36/37/39-22
S22: Do not breathe dust. 
S26: In case of contact with eyes, rinse immediately with plenty of water and seek medical advice. 
S36/37/39: Wear suitable protective clothing, gloves and eye/face protection.
WGK Germany: 2
RTECS: WP0700000
Hazard Note: Irritant
HazardClass: IRRITANT

Specification

Side effects of Sulfamethoxazole (CAS NO.723-46-6):
The most common side effect of Sulfamethoxazole is gastrointestinal upset. Allergies to sulfa-based medications typically cause skin rashes, hives, or trouble breathing or swallowing and warrant immediate discontinuation of the medication and contact with doctor immediately. In addition Sulfamethoxazole/trimethoprim is also known to increase blood concentrations of the drug warfarin and can cause an unexpected increase in clotting time and uncontrolled bleeding. Sulfamethoxazole can also bring adverse effects Neutropenia and thrombocytopenia if a patient is placed on long-term therapy.

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