If you are currently being treated with any of the following medications, you should not use Roman chamomile without first talking to your healthcare provider.

Sedatives
Because of its calming effects, chamomile should not be taken in conjunction with sedative medications (particularly those that belong to a class called benzodiazepines such as alprazolam and lorazepam) or alcohol.

Warfarin
Patients taking blood-thinning medications such as warfarin should use Roman chamomile only under the careful supervision of a healthcare practitioner. Although not proven scientifically, this herb may, in theory, enhance the effects of the medication.