Assertion: morphine's use | /r/HasSubevent | tolerance
Facets:
value: to the drug
type: OTHER
Source sentences:
text: Prolonged, continuous use of butorphanol tartrate may result in physical dependence or tolerance (a decrease in response to a given dose).
text: Chronic use of codeine can result in some tolerance to the drug so that higher doses must be taken to obtain the same initial effects.