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Yes the oral route for drug administration is the safest route.
The oral route of administration.
biovability of intral nasal route
yes
Topical
Usually used in connection with how a medication is given into the body, as the oral route, the intramuscular or intravenous route of administration.
Robitussin CF is a cold formula only; Robitussin DM contains the cough suppressant dextromethorphan, which, when taken in large doses, is capable of producing psychotropic effects. Robitussin CF does not contain that drug.
Intravenous
buccal
per oral- which means oral route of administration.
Intravenous (IV)
is Robitussin and tussin dm the same thing