Assertion: phenytoin's effect | /r/HasProperty | variable
Facets:
Source sentences:
text: The effect of phenytoin on warfarin is variable and prothrombin times should be determined when these agents are combined.
text: The effect of phenytoin on warfarin is variable and prothrombin times should be determined when these agents are combined.
text: The effect of phenytoin on warfarin is variable and prothrombin times should be determined when these agents are combined.
text: The effect of phenytoin on warfarin is variable and prothrombin times should be determined when these agents are combined.