Herbs can help treat a variety of conditions & in some cases may have fewer side effects than some conventional medications. But because they are unregulated, herbal products are often mislabeled & may contain additives & contaminants that aren' t listed on the label. Some herbs may cause allergic reactions or interact with conventional drugs, & some are poisonous if used improperly or at high doses. Taking herbs by yourself increases your risk, so it is important to consult your doctor or pharmacist before taking herbal medicines. Some examples of adverse reactions from sure popular herbs are described below.
- St. John's wort may cause your skin to be more sensitive to the sun's ultraviolet rays, and may cause an allergic reaction, stomach upset, fatigue, and restlessness. Clinical studies have found that St. John's wort also interferes with the effectiveness of lots of drugs, including the blood thinner warfarin (Couamdin), protease inhibitors for HIV, birth control pills, definite asthma drugs, and lots of other medications. In addition, St. John's wort ought to not be taken with prescribed antidepressant medication. The FDA has issued a public health advisory concerning lots of of these interactions.
- Kava kava has been linked to liver toxicity. Kava has been taken off the market in several countries because of liver toxicity.
- Valerian may cause sleepiness, & in some people it may even have the unexpected effect of overstimulating in lieu of sedating.
- Garlic, ginkgo, feverfew, & ginger, among other herbs, may increase the risk of bleeding.
- Evening primrose (Oenothera biennis) may increase the risk of seizures in individuals who have seizure disorders
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