SOY - Uses, Side Effects, and More

Medications for depression (MAOIs) interacts with SOY

Fermented soy products such as tofu and soy sauce contain tyramine. Tyramine is a naturally occurring chemical that is involved in blood pressure regulation. MAOIs can decrease how quickly the body breaks down tyramine. Consuming more than 6 mg of tyramine while taking one of these medications can increase the risk of serious side effects, such as very high blood pressure. If you take one of these medications, avoid fermented soy products that contain high amounts of tyramine. Some common MAOIs include phenelzine (Nardil), selegiline (Zelapar), and tranylcypromine (Parnate).

Estrogens interacts with SOY

Large amounts of soy might have some of the same effects as estrogen. Taking soy along with estrogen pills might decrease the effects of estrogen pills.

Tamoxifen (Nolvadex) interacts with SOY

Tamoxifen affects the activity of estrogen in the body. Soy seems to also affect estrogen activity in the body. Taking soy with tamoxifen might change the effects of tamoxifen. Speak with a healthcare provider if you are taking tamoxifen.

Warfarin (Coumadin) interacts with SOY

Warfarin is used to slow blood clotting. Soy has been reported to decrease the effects of warfarin. This might increase the risk of clotting. Be sure to have your blood checked regularly. The dose of your warfarin might need to be changed.

Medications for diabetes (Antidiabetes drugs) interacts with SOY

Soy might lower blood sugar levels. Taking soy along with diabetes medications might cause blood sugar to drop too low. Monitor your blood sugar closely.

Medications for high blood pressure (Antihypertensive drugs) interacts with SOY

Soy might lower blood pressure. Taking soy along with medications that lower blood pressure might cause blood pressure to go too low. Monitor your blood pressure closely.

Levothyroxine (Synthroid, others) interacts with SOY

Levothyroxine is used for low thyroid function. Soy seems to decrease how much levothyroxine is absorbed by the body in infants, but not adults. This might decrease the effects of levothyroxine in infants. The dose of levothyroxine may need to be adjusted if soy is being used regularly, such as in soy-based formulas. Otherwise, take levothyroxine and soy at least 4 hours apart.

Progesterone interacts with SOY

Some research shows that taking soy milk along with progesterone might increase bone loss in females with osteoporosis.

Water pills (Diuretic drugs) interacts with SOY

Soy can increase urine production. The effects seem to be similar to those of "water pills." Taking soy along with "water pills" might increase the risk for side effects.

Caffeine interacts with SOY

Soy contains the chemical genistein. Genistein might slow down how quickly the body gets rid of caffeine. This might increase the effects of caffeine.

Antibiotic drugs interacts with SOY

Antibiotics are used to reduce harmful bacteria in the body. Antibiotics can also reduce friendly bacteria in the intestines. Friendly bacteria in the intestines help to convert soy to its active form. By reducing the number of bacteria, antibiotics might decrease the effects of soy. But it is too soon to know if this interaction is a big concern.

Medications changed by the liver (Cytochrome P450 2C9 (CYP 2C9) substrates) interacts with SOY

Some medications are changed and broken down by the liver. Soy might change how quickly the liver breaks down these medications. This could change the effects and side effects of these medications.

CONDITIONS OF USE AND IMPORTANT INFORMATION: This information is meant to supplement, not replace advice from your doctor or healthcare provider and is not meant to cover all possible uses, precautions, interactions or adverse effects. This information may not fit your specific health circumstances. Never delay or disregard seeking professional medical advice from your doctor or other qualified health care provider because of something you have read on ishonest. You should always speak with your doctor or health care professional before you start, stop, or change any prescribed part of your health care plan or treatment and to determine what course of therapy is right for you.

This copyrighted material is provided by Natural Medicines Comprehensive Database Consumer Version. Information from this source is evidence-based and objective, and without commercial influence. For professional medical information on natural medicines, see Natural Medicines Comprehensive Database Professional Version. © Therapeutic Research Faculty 2018.

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