St John 's wort is generally well tolerated .
St John 's wort may cause gastrointestinal discomfort ( such as nausea , abdominal pain , loss of appetite , and diarrhea ) , dizziness , confusion , fatigue , sedation , dry mouth , restlessness , and headache .
St John 's wort is generally well tolerated , but may cause gastrointestinal discomfort ( such as nausea , abdominal pain , loss of appetite , and diarrhea ) , dizziness , confusion , fatigue , sedation , dry mouth , restlessness , and headache .