Herbal Diuretics Causing Potassium Loss

Herbal diuretics are commonly promoted as a weight-loss aid. While shedding water can mean eliminating some weight, it also can contribute to problems such as potassium loss. Potassium levels that fall too low cause problems, including muscle cramps, fatigue, weakness, constipation and heart rhythm problems. Always consult a doctor before trying an herbal formulation, especially if you take medication or have a health condition.

Significance

While herbals can have diuretic effects, they are not as effective at producing this result as diuretic drugs that are prescribed for high blood pressure or edema, meaning fluid retention, according to "Exercise and Sport Nutrition," by Richard B. Kreider, et al. Potassium loss is one of the unwanted side effects that can occur with diuretic medicines. Herbal diuretics may cause some degree of potassium loss as well, but the clinical significance of this remains unknown as of 2009, according to "Herbs and Natural Supplements," Lesley Braun and Marc Cohen.

Combinations

Some herbs that are not used as diuretics do affect your potassium levels. These include licorice, guarana, adonis, black hellebore, horsetail, strophanthus and herbal laxatives like aloe, senna, buckthorn and cascara. Some of these herbs, especially those used as laxatives, may be combined with diuretic herbs in weight-loss formulations.

Additive Effect With Medicine

Taking herbs with diuretic effects in combination with drugs that promote water loss may raise your risk for dehydration and low potassium levels. Herbs that have diuretic properties include artichoke, agrimony, buchu, burdock, corn silk, celery, poke, juniper, Scotch broom, squill, uva ursi, yarrow, shephed's purse and stone root. One of these herbs, corn silk, is noted for having the side effect of lowering your levels of blood potassium on its own, note George T. Grossberg and Barry Fox, authors of "The Essential Herb-Drug-Vitamin Interaction Guide."

Considerations

Herbs with diuretic properties may cause side effects other than possible potassium loss. Uva ursi, for example, can cause vomiting, nausea and liver damage. Agrimony can cause digestive problems and constipation. Buchu can induce appetite loss and boost menstrual flow. Juniper may cause kidney irritation. Scotch broom can cause nausea, palpitations and headaches. Shepherd's purse can affect your thyroid function and blood pressure. Stone root can lead to painful urination and gastrointestinal irritation.

Poke can be toxic and cause lowered blood pressure, blurred vision and confusion. Squill contains cardiac glycosides, which can lead to heart problems and even death. Poke can be toxic and cause lowered blood pressure, blurred vision and confusion.