calyx156 replied: "Chamomile is an extremely mild and gentle relaxant herb. The only negative reaction I am aware of with it is that some people who are allergic to ragweed, goldenrod (Solidago), asters, chrysanthemums are also allergic to chamomile. This is taken from: Prescription Drugs Chamomile contains chemicals that may increase the time blood needs to clot. When it is taken with antiplatelet or anticoagulant drugs, the effect of the antiplatelet or anticoagulant may be increased, resulting in uncontrolled bleeding. Antiplatelet drugs include Plavix and Ticlid Anticoagulants include heparin and warfarin When chamomile is used with prescription drugs that promote sleepiness, the effects of the prescription drug may be exaggerated, resulting in sedation or mental impairment. Prescription drugs that can cause sleepiness include: Anticonvulsants such as carbamazepine (Tegretol), phenytoin (Dilantin), and valproic acid (Depakote) Barbiturates such as phenobarbital Benzodiazepines such as alprazolam (Xanax) and diazepam (Valium) Drugs for insomnia such as zaleplon (Sonata) and zolpidem (Ambien) Tricyclic antidepressants such as amitriptyline (Elavil), amoxapine, doxepin and nortriptyline Chamomile is broken down by certain enzymes in the liver, therefore it may interfere with the use of prescription drugs that are processed by the same enzymes. These drugs may include: Allergy drugs such as fexofenadine (Seldane) Antifungal drugs such as itraconazole (Sporanox) and ketoconazole (Nizoral) Cancer drugs such as etoposide (VePesid), paclitaxel (Onxol, Taxol), vinblastine, or vincristine Drugs for high cholesterol such as lovastatin (Mevacor) Oral contraceptives Non-prescription Drugs Chamomile can affect the ability of blood to clot after. Aspirin can also delay clotting, so chamomile should not be taken at the same time as aspirin. The sleep-producing effects of over-the-counter products containing diphenhydramine can be enhanced by taking chamomile concurrently. Diphenhydramine is contained in many over-the-counter sleep aids as well as in some cough and cold products, therefore caution should be used when taking these medications with chamomile because excessive drowsiness may result."

Jane D replied: "Beats the s**t out of me."