What decreases the absorption of Synthroid?

Here's one article about that:


http://www.pharmacytimes.com/issue/pharmacy/2008/2008-11/2008-11-8767



If you google "levothyroxine absorption", you'll get a lot more.



Basically, it's best to take your Synthroid on an empty stomach, with water. All sorts of foods and other meds have been reported to affect absorption.

iron pills and certain vitamins. Even if you take the iron later in the day it still affects it. When I was pregnant with my second son, I couldn't take prenatals at all. It absorbed all my thyroid pill

I didn't know that...
I drink soy milk because I'm lactose intolerant.
My thyroid had been low lately.

Joy

I pulled out my "thyroid for dummies" book to look up interactions. Here's what they list:
lithium (eskalith, lithium carbonate, lithobid)
ethionamide (Trecator-sc), fluorine (like in our city water!), aminoglutethimide, ketoconazole (Nizoral), para-aminosalicylic acid (Paser granules), sulfonamide drugs (sulfadiazine, sulfasoxazole,acetazoleamide) (bactrim, septra), certain sulfonylureas (tolbutamide, chlorpropamide), thionamide drugs (including propylthiouricil, methimazole,carbimazole)
isoflavins (found in soybeans)
thiocyanate (found in brussel sprouts,cauliflower, cabbage, horseradish, kale, kohlrabi, mustard, rutabaga, and turnips. If cattle eats this and you drink their milk it can affect you too.)
estrogens, clofibrate, Perphe****ne (prochlorperazine, trifluoperazine, chlorpromazine, estrafon, trifon), anabolic steriods, androgens
Glucocorticoids (Celestone, decadron, depo-medrol, hydrocortone, solu-medrol powder)
Nicotinic acid, heroin and methadone, amiodarone
aluminum hydroxide(amphogel, maalox, mylanta, alu-cap)
carbamazepine, diphenylhydantoin, cholestyramine, colestipol, ferrous sulfate (iron)
phenobarbital, rifampin (rifadin, Rifater), sucralfate (carafate)
aspirin (8-10 per day)(Darvon, Ecotrin, Excedrin, Fiorinal halprin, norgesic, percodan, robaxisal, soma,fiortal, gelpirin, propoxyphene, roxiprin)
bromergocryptine (parlodel, bromocryptine Mesylate)
clofibrate, dopamine, octreotide, opiates
pamidronate (aredia), phentolamine, pyridoxine (B6), avandia, actos, glyset, prandin, starlix
furosemide (lasix, furosemide)
adderall
reglan, metoclopramide, tagamet, cimetidine, zantac, ranitidine
haldol

these can cause false positives:
salicylates, diphenylhydantoin, carbamazepine, furosemide, heparin, orphenadrine

These can cause hyperthyroidism:
amphetamine, cimetidine, ranitidine, clomiphene, l-dopa inhibitors, metoclopramide, domperidone,iodine, lithium

Foods to avoid:
soybeans, broccoli, cauliflower (Brassica Group of veggies), bamboo shoots, sweet potatoes, corn, lima beans. Also brussel sprouts, cauliflower, cabbage, horseradish, kale, kohlrabi, mustard, rutabaga, and turnips.

I was shocked at everything I found!

Joy