dechallenge

is likely misspelled.

has no English definition.

As a verb dechallenge

is to stop administering a drug to a patient, to see whether its suspected effects cease to occur.

As verbs the difference between dechallenge and dechallenged

is that dechallenge is (medicine|pharmacology) to stop administering a drug to a patient, to see whether its suspected effects cease to occur while dechallenged is (dechallenge).

Rechallenge is a related term of dechallenge.

In medicine pharmacology terms the difference between dechallenge and rechallenge

is that dechallenge is to stop administering a drug to a patient, to see whether its suspected effects cease to occur while rechallenge is the event of a rechallenge as above.

As a noun rechallenge is

a challenge made in return.

As a noun taxonomy

is the science or the technique used to make a classification.

As a verb dechallenge is

(medicine|pharmacology) to stop administering a drug to a patient, to see whether its suspected effects cease to occur.