IR; 

freely soluble in water and in ethanol (96 per cent).

Solution S is clear and colourless.

−43° to −47° (dried substance).

To 10mL of solution S add 0.1mL of methyl red solution R and 0.2mL of 0.01M sodium hydroxide. The solution is yellow. Not more than 0.4mL of 0.01M hydrochloric acid is required to change the colour of the indicator to red. 

≤1.0% 

≤0.1% 

≤0.1% 

≤0.1% 

≤0.2% 

98.5%~101.0%

It is used to prevent and treat hypotension caused by spinal anesthesia, general anesthesia, chlorpromazine, supraventricular tachycardia and mydriasis.

Preserve in tight, light-resistant containers. Store at controlled room temperature.