Product Identification

Product Name

Leflunomide

Synonyms

4-Isoxazolecarboxamide, 5-methyl-N-(4-(trifluoromethyl)phenyl)-
5-Methylisoxazole-4-carboxylic acid (4-trifluoromethyl)anilide
5-Methyl-N-(4-(trifluoromethyl)phenyl)-4-isoxazolecarboxamide
Arava
HWA-486

CAS

75706-12-6

Formula

C12H9F3N2O2

Molecular Weight

270.20999999999998

RTECS

NY2354200

Merck

12,10407

Physical and Chemical Properties

Solubility in water

Insoluble

Boiling Point

289

Vapor Pressure

0.0022 (25 C)

Density

1.392 g/cm3 (20 C)

pKa/pKb

11.45 (pKa)

Partition Coefficient

1.95

Heat Of Vaporization

52.9 kJ/mol

Usage

Used in active moderate to severe rheumatoid arthritis and psoriatic arthritis.

Handling and Storage

Storage

Store in original container in a cool dark place.

Hazards Identification

Inhalation

Remove to fresh air. If not breathing give artificial respiration. If breathing is difficult, give oxygen. Seek medical attention.

Skin

Immediately wash skin with soap and copious amounts of water for at least 15 minutes. If irritation persists, seek medical attention.

Eyes

Immediately flush eyes with copious amounts of water for at least 15 minutes. Seek medical advice.

Ingestion

If swallowed, wash out mouth with water, provided person is conscious. Seek medical advice.

Exposure Controls/Personal Protection

Personal Protection

Wear self-contained breathing apparatus, rubber boots & heavy rubber gloves.

Fire Fighting Measures

Flash Point

129

Fire Fighting

Extinguish with carbon dioxide, dry chemical powder or appropriate foam. Water spray. Wear self-contained breathing apparatus and protective clothing to prevent contact with the skin and eyes.

Accidental Release Measures

Small spills/leaks

Sweep-up/absorb in suitable material, place in a container and hold for disposal. Avoid raising dust. Ventilate area and wash spill site after pickup is complete.

Stability and Reactivity

Combustion Products

Emits toxic fumes under fire conditions.