It is topic of today, what is primary action of
drug? According to cardinal principle of Homeopathy, "Law of Simila" a drug or a
medicine when administered to human being, it produces certain changes inside
human body. These changes produced by drug inside human body collectively given
a name of primary action of drug.
So, does this primary action is produced
by dynamic drugs or crude drugs? Well it is produced by both. Dynamic
drugs produce changes fast, being at same level at which vital force is, and
that is dynamic level. Whereas crude drugs produce changes slowly being
non-dynamic in nature. Initial changes produced by dynamic drugs are slight but
functional and at dynamic level. But, crude drugs produce changes at structural
level.

For example, when Arsenic is
administered to a human body of living individual, then it crop certain
toxic changes, then these toxic changes are called primary action of drug
arsenic on human body.
Next know- How vital force help in curing human body?