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that is not a question dumbo
Yes the oral route for drug administration is the safest route.
Dermal Patches, gels, creames.
Yes. This would be fine - always consult with your Doctor or Pharmacist before mixing any medications regardless of route of administration (in your case oral and trans dermal).
The oral route of administration.
biovability of intral nasal route
Topical
yes
Usually used in connection with how a medication is given into the body, as the oral route, the intramuscular or intravenous route of administration.
Your skin is the dermal.
Intravenous
buccal