Synthroid (levothyroxine) treats hypothyroidism (low thyroid hormone) and different types of goiters (enlarged thyroid gland). Includes Synthroid side effects, interactions and indications. Medical use. Levothyroxine is typically used to treat hypothyroidism, and is the treatment of choice for people with hypothyroidism, who often require lifelong thyroid hormone therapy. Doses of levothyroxine that normalize serum TSH may not normalize LDL cholesterol and total cholesterol. Hypothyroidism. Synthroid is indicated as a replacement therapy in primary (thyroidal), secondary (pituitary), and tertiary (hypothalamic) congenital or acquired hypothyroidism. SYNTHROID prescription and dosage sizes information for physicians and healthcare professionals. Pharmacology, adverse reactions, warnings and side effects. You have to spread the Prevacid out from food altogether I believe and then split it out again or concurrent with the Synthroid by some time. I get a very dry mouth with the Prevacid. I agree with gimel that acid reflux is often associated with being hypo. In desperation, I've even chugged dill pickle juice - sometimes it helped, sometimes not, but getting out of that hypo state is most important. Contrary to the doctor's opinion, I don't believe that what you're experiencing are separate cardiac and gastrointestinal problems. I believe that the stomach gas pressure is directly responsible for the heart symptoms - at least in my case it is. Acid reflux refers to the flow of stomach acid back into your esophagus, a connecting tube between your throat and stomach. It is also known as gastroesophageal reflux and occurs as heartburn, a burning sensation in your chest. My mother has had IBS for years and has used prilosec for quite a while. A few months ago, she was put on Omeprazole and after 2 weeks of bad upper stomach pain, she stopped taking it. Learn about Synthroid (Levothyroxine Sodium) may treat, uses, dosage, side effects, drug interactions, warnings, patient labeling, reviews, and related medications.