Saturday, June 15, 2013

Possible Interactions:green tea&any of the following medications

Possible Interactions:

If you are being treated with any of the following medications, you should not drink green tea or take green tea extract without first talking to your health care provider:
Adenosine -- Green tea may inhibit the actions of adenosine, a medication given in the hospital for an irregular and usually unstable heart rhythm.
Beta-lactam -- Green tea may increase the effectiveness of beta-lactam antibiotics by making bacteria less resistant to treatment.
Benzodiazepines -- Caffeine, including caffeine from green tea, may reduce the sedative effects of these medications commonly used to treat anxiety, such as diazepam (Valium) and lorazepam (Ativan).
Beta-blockers, Propranolol, and Metoprolol -- Caffeine, including caffeine from green tea, may increase blood pressure in people taking propranolol (Inderal) and metoprolol (Lopressor, Toprol XL). These medications are used to treat high blood pressure and heart disease.
Blood Thinning Medications -- People who take warfarin (Coudamin) should not drink green tea. Since green tea contains vitamin K, it can make this medication ineffective. You should not mix green tea and aspirin because they both prevent blood from clotting. Using the two together may increase your risk of bleeding.
Chemotherapy -- The combination of green tea and chemotherapy medications, specifically doxorubicin and tamoxifen, increased the effectiveness of these medications in laboratory tests. However, the same results have not been found in studies on people. On the other hand, there have been reports of both green and black tea extracts affecting a gene in prostate cancer cells that may make them less sensitive to chemotherapy drugs. For that reason, people should talk to their doctors before drinking black and green tea or taking tea extracts while undergoing chemotherapy.
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University of Maryland Medical Center

Clozapine (Clozaril) -- The effects of the clozapine may be reduced if taken within 40 minutes after drinking green tea.
Ephedrine -- When taken with ephedrine, green tea may cause agitation, tremors, insomnia, and weight loss.
Lithium -- Green tea has been shown to reduce blood levels of lithium, a medication used to treat bipolar disorder. That can make lithium less effective.
Monoamine Oxidase Inhibitors (MAOIs) -- Green tea may cause a severe increase in blood pressure, called a "hypertensive crisis," when taken together with these drugs used to treat depression. Examples of MAOIs include:
  • Isocarboxazid (Marplan)
  • Moclobemide (Manerix)
  • Phenelzine (Nardil)
  • Tranylcypromine (Parnate)
Birth control pills -- Oral contraceptives can prolong the amount of time caffeine stays in the body, which may increase its stimulating effects.
Phenylpropanolamine -- A combination of caffeine, including caffeine from green tea, and phenylpropanolamine, used in many over-the-counter and prescription cough and cold medications and weight loss products, may cause mania and a severe increase in blood pressure. The FDA issued a public health advisory in November 2000 to warn people of the risk of bleeding in the brain from use of this medication and urged all manufacturers of this drug to remove it from the market. Most drugs that contained phenylpropanolamine have been reformulated without it.
Quinolone antibiotics -- Green tea may makes these medications more effective and also increase the risk of side effects. These medications include:
  • Ciprofloxacin (Cipro)
  • Enoxacin (Penetrex)
  • Grepafloxacin (Raxar)
  • Norfloxacin (Chibroxin, Noroxin)
  • Sparfloxacin (Zagam)
  • Trovafloxacin (Trovan)
Other medications -- Green tea, especially caffeinated green tea, may interact with a number for medications, including:
  • Acetaminophen (Tylenol)
  • Carbamazepine (Tegretol)
  • Dipyridamole (Persatine)
  • Estrogen
  • Fluvoxamine (Luvox)
  • Methotrexate
  • Mexiletine (Mexitil)
  • Phenobarbital
  • Theophylline
  • Verapamil (Bosoptin, Calan, Covera- HS, Verelan, Verelan PM)
To be safe, check with your health care provider before drinking or taking green tea if you also take other medications.
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