Drug
Chlorothiazide
Pronounced
"klor-oh-THIGH-uh-zide"
Drug Interactions
See also How to Use section.
Drug interactions may change how your medications work or increase your risk for serious side effects. This document does not contain all possible drug interactions. Keep a list of all the products you use (such as prescription/nonprescription drugs and herbal products) and share it with your doctor and pharmacist. Do not start, stop, or change the dosage of any medicines without your doctor's approval.
Some products that may interact with this drug are: dofetilide, lithium.
Some products have ingredients that could raise your blood pressure or worsen your swelling. Tell your pharmacist what products you are using, and ask how to use them safely (especially cough-and-cold products, diet aids, or NSAIDs such as ibuprofen/naproxen).
This product may interfere with certain lab tests. Make sure lab personnel and all your doctors know you use this drug.
Negative Interactions
5- Potential Negative Interaction
Chlorothiazide
Dandelion
This interaction is based on this drug belonging to a drug class. While this drug may differ from the text and references below, drugs within this class work in a similar way and this interaction is applicable to drugs within the same class.
Herbs that have a diuretic effect should be avoided when taking diuretic medications, as they may increase the effect of these drugs and lead to possible cardiovascular side effects. These herbs include dandelion, uva ursi, juniper, buchu, cleavers, horsetail, and gravel root.DandelionChlorothiazide- Brinker F. Herb Contraindications and Drug Interactions. Sandy, OR: Eclectic Institute, 1997, 102-3.
- Potential Negative Interaction
Chlorothiazide
Digitalis
Digitalis (Digitalis purpurea) refers to a family of plants commonly called foxglove, which contains digitalis glycosides, chemicals with actions and toxicities similar to the prescription drug digoxin. Thiazide diuretics can increase the risk of digitalis-induced heart disturbances. Thiazide diuretics and digitalis-containing products should be used only under the direct supervision of a doctor trained in their use.
DigitalisChlorothiazide- Threlkeld DS, ed. Diuretics and Cardiovasculars, Thiazides and Related Diuretics. In Facts and Comparisons Drug Information. St. Louis, MO: Facts and Comparisons, Apr 1993, 135a-7c.
- Potential Negative Interaction
Chlorothiazide
Diuretic Herbs
Herbs that have a diuretic effect should be avoided when taking diuretic medications, as they may enhance the effect of these drugs and lead to possible cardiovascular side effects. These herbs include dandelion, uva ursi, juniper, buchu, cleavers, horsetail, and gravel root.
Use buckthorn (Rhamnus catartica, Rhamnus frangula, Frangula alnus) or alder buckthorn for more than ten days consecutively may cause a loss of electrolytes (especially the mineral potassium). Medications that also cause potassium loss, such as some diuretics, should be used with caution when taking buckthorn or alder buckthorn.
Diuretic HerbsChlorothiazide- Brinker F. Herb Contraindications and Drug Interactions. Sandy, OR: Eclectic Institute, 1997, 102-3.
- European Scientific Cooperative on Phytotherapy (ESCOP). Frangulae cortex, frangula bark. Monographs on the Medicinal Uses of Plant Drugs. Exeter, UK: University of Exeter, Centre for Complementary Health Studies, 1997.
- Potential Negative Interaction
Chlorothiazide
Ginkgo
One case was reported in which ginkgo use was associated with high blood pressure in a person treated with a thiazide diuretic. Ginkgo was not proven to be the cause of this reaction.
GinkgoChlorothiazide- Shaw D et al. Traditional remedies and food supplements: a 5-year toxicological study (1991-1995). Drug Safety 1997;17:342-56.
- Potential Negative Interaction
Chlorothiazide
Licorice
Licorice (Glycyrrhiza glabra) may increase the side effects of potassium-depleting diuretics, including thiazide diuretics. Thiazide diuretics and licorice should be used together only under careful medical supervision. At the time of this writing, no evidence was found of interactions between deglycyrrhizinated licorice (DGL) and any diuretic was found in the medical literature.
LicoriceChlorothiazide- Shintani S, Murase H, Tsukagoshi H, Shiigai T. Glycyrrhizin (licorice)-induced hypokalemic myopathy. Report of two cases and review of the literature. Eur Neurol 1992;32:44-51.
Supportive Interactions
3- Replenish Depleted Nutrients
Chlorothiazide
Folic Acid
One study showed that people taking diuretics for more than six months had dramatically lower blood levels of folic acid and higher levels of homocysteine compared with individuals not taking diuretics. Homocysteine, a toxic amino acid byproduct, has been associated with atherosclerosis. Until further information is available, people taking diuretics for longer than six months should probably supplement with folic acid.
Folic AcidChlorothiazide- Morrow LE, Grimsley EW. Long-term diuretic therapy in hypertensive patients: effects on serum homocysteine, vitamin B6, vitamin B12, and red blood cell folate concentrations. South Med J 1999;92:866-70.
- Replenish Depleted Nutrients
Chlorothiazide
Magnesium and Potassium
Potassium-depleting diuretics, including thiazide diuretics, cause the body to lose potassium; they may also cause cellular magnesium depletion, although this deficiency may not be reflected by a low blood level of magnesium. Magnesium loss induced by potassium-depleting diuretics can cause additional potassium loss. Until more is known, it has been suggested that people taking potassium-depleting diuretics, including thiazide diuretics, should supplement both potassium and magnesium.
People taking thiazide diuretics should be monitored by their prescribing doctor, who will prescribe potassium supplements if needed. Such supplementation is particularly critical before surgery in patients with a history of heart disease. In a preliminary study, people with low blood levels of potassium (in part related to diuretic use) had a higher incidence of serious problems resulting from surgery (including death) compared with those having normal potassium levels. A double-blind trial showed that thiazide diuretic use led to a reduction in blood levels of potassium in some participants. Those experiencing decreased potassium levels were also more likely to experience cardiovascular events, such as heart attacks, stroke, heart failure, aneurysm, and sudden cardiac death. Fruit is high in potassium, and increasing fruit intake (especially bananas) is another way of supplementing potassium.
Magnesium supplementation for people taking thiazide diuretics is typically 300–600 mg per day, though higher amounts (over 800 mg per day) have been reported in a controlled study to reduce side effects of thiazides. Combining supplementation of both potassium and magnesium has been reported to correct abnormally low blood levels of potassium and also to protect against excessive loss of magnesium.
Magnesium and PotassiumChlorothiazide- Martin B, Milligan K. Diuretic-associated hypomagnesiumia in the elderly. Arch Intern Med 1987;147:1768-71.
- Kroenke K, Wood DR, Hanley JF. The value of serum magnesium determination in hypertensive patients receiving diuretics. Arch Intern Med 1987;147:1553-6.
- Whang R, Whang DD, Ryan MP. Refractory potassium repletion. A consequence of magnesium deficiency. Arch Intern Med 1992;152:40-5.
- Wahr JA, Parks R, Boisvert D, et al. Preoperative serum potassium levels and perioperative outcomes in cardiac surgery patients. JAMA 1999;281:2203-10.
- Franse LV, Pahor M, Di Bari M, et al. Hypokalemia associated with diuretic use and cardiovascular events in the Systolic Hypertension in the Elderly Program. Hypertension 2000;35:1025-30.
- Ruml LA, Gonzalez G, Taylor R, et al. Effect of varying doses of potassium-magnesium citrate on thiazide-induced hypokalemia and magnesium loss. Am J Ther 1999;6:45-50.
- Ruml LA, Pak CYO. Effect of potassium magnesium citrate on thiazide-induced hypokalemia and magnesium loss. Am J Kidney Dis 1999;34:107-13.
- Replenish Depleted Nutrients
Chlorothiazide
Zinc
Thiazide diuretics can increase urinary zinc loss.
ZincChlorothiazide- Reyes AJ, Leary WP, Lockett CJ, et al. Diuretics and zinc. S Afr Med J 1982;62:373-5.
Explanation Required
3- Needs Explanation
Chlorothiazide
Calcium
Thiazide diuretics decrease calcium loss in the urine due to actions on the kidneys. As a result, it may be less important for some people taking thiazide diuretics to supplement calcium than it is for other people.
CalciumChlorothiazide- Threlkeld DS, ed. Diuretics and Cardiovasculars, Thiazides and Related Diuretics. In Facts and Comparisons Drug Information. St. Louis, MO: Facts and Comparisons, Jul 1993, 135a-7c.
- Needs Explanation
Chlorothiazide
Sodium
Diuretics, including thiazide diuretics, cause increased loss of sodium in the urine. By removing sodium from the body, diuretics also cause water to leave the body. This reduction of body water is the purpose of taking diuretics. Therefore, there is usually no reason to replace lost sodium, although strict limitation of salt intake in combination with the actions of diuretics can sometimes cause excessive sodium depletion. On the other hand, people who restrict sodium intake, and in the process reduce blood pressure, may need to have their dose of diuretics lowered.
- Needs Explanation
Chlorothiazide
Vitamin D
The reduction in urinary calcium loss resulting from treatment with thiazide diuretics is due primarily to changes in kidney function and may also be due, in part, to changes in vitamin D metabolism. However, there is no evidence to suggest that people taking diuretics have different requirements for vitamin D.
Vitamin DChlorothiazide- Riis B, Christiansen C. Actions of thiazide on vitamin D metabolism: A controlled therapeutic trial in normal women early in the postmenopause. Metabolism 1985;34:421-4.