Q39: What're residual solvents? - Why are they used in the ma | Pharma Q.

Q39: What're residual solvents?

- Why are they used in the manufacturing of drug substances and excipients??

-How many classes are they classified to according to their risk assessments to human health?

-Benzene is Carcinogenic , therefore it's a class I ..what's the permitted daily exposure of it???

-How many options for describing the limit of class II solvents??

- in which class can we use LOD (that's non specific method of analysis) to determine the amount of residual solvents of this class?? and what's the limit ??