epinephrine vs levothyroxine
Side-by-side comparison of epinephrine and levothyroxine. Data from FDA drug databases (Orange Book, NDC Directory, recalls, shortages) covering 20,000+ approved drugs, plus CMS pricing; see our methodology.
minor Known Drug Interaction
( 7 .1) Drugs that potentiate the effects of epinephrine include sympathomimetics, beta blockers, tricyclic antidepressants, MAO inhibitors, COMT inhibitors, clonidine, doxapram, oxytocin, levothyroxine sodium, and certain antihistamines.
Recommendation: Your healthcare provider should watch your heart rate and blood pressure carefully if you are using both of these drugs.
EpiPen, Adrenalin
Synthroid, Levoxyl, Tirosint
Epinephrine injection is a medicine that raises blood pressure. It is used for adults with very low blood pressure due to septic shock.
Levothyroxine is a medicine that replaces a hormone normally made by your thyroid gland. It is used when the thyroid doesn't make enough hormone on its own.
Epinephrine injection is used to increase blood pressure in adults. It is specifically for those who have low blood pressure because of septic shock. Septic shock is a severe condition caused by infection.
This medicine treats hypothyroidism, a condition where the thyroid gland doesn't make enough thyroid hormone. It can be used in adults and children, even newborns. Levothyroxine can also be used after surgery and radioiodine therapy for thyroid cancer to help lower thyroid-stimulating hormone (TSH) levels.
Epinephrine works on alpha and beta receptors in your body. This causes your blood vessels to narrow and your heart to beat stronger and faster. As a result, your blood pressure increases.
Levothyroxine provides a synthetic form of thyroxine (T4), which is the main hormone produced by the thyroid gland. Your body converts T4 into triiodothyronine (T3), the active form of the hormone. By providing T4, levothyroxine helps restore normal thyroid hormone levels in your body.
- • Headache
- • Anxiety
- • Feeling restless
- • Shaking
- • Weakness
- • Fatigue
- • Increased appetite
- • Weight loss
- • Feeling hot
- • Headache
- Headache 4,161
- Sinus infection 3,917
- Tiredness 3,761
- Difficulty breathing 3,216
- Pain 3,152
- Tiredness 25,847
- Feeling sick to your stomach 22,021
- Head pain 18,798
- Loose stools 18,178
- Difficulty breathing 16,216
Your blood pressure will be checked often while you are taking this medicine. Epinephrine can raise your blood pressure too high. It can also cause fluid to build up in your lungs. Epinephrine may cause irregular heartbeats or reduce blood flow to the heart. Avoid leakage of the medicine into the tissues, as this can cause tissue damage. This medicine contains sulfite, which can cause allergic reactions.
Thyroid hormones, including levothyroxine, should not be used for weight loss or to treat obesity. Using high doses can cause serious and life-threatening side effects, especially when taken with stimulant medicines.
Epinephrine may harm your unborn baby. Tell your doctor if you are pregnant or plan to become pregnant. Epinephrine can also slow down labor.
Tell your doctor if you are pregnant or plan to become pregnant. Your levothyroxine dose may need to be adjusted during pregnancy. Levothyroxine passes into breast milk, but it is not expected to harm the baby.
How to Read This epinephrine vs levothyroxine Comparison
epinephrine is classified in the Adrenergic Agonist drug class, while levothyroxine sits within the Thyroid Hormone class. Drugs from different classes work through distinct mechanisms, so a head-to-head comparison illustrates trade-offs rather than equivalence. Both drugs are prescription-only, so a licensed provider must authorize use.
Adverse event totals above are pulled from the FDA's Adverse Event Reporting System (FAERS). For these top-ranked reactions alone, epinephrine has 18,207 submissions while levothyroxine has 101,060. Those figures reflect cumulative reporting volume, not per-patient risk, so older, widely dispensed drugs typically look worse on count alone. These two drugs have a known minor interaction flagged in FDA labeling, attributed to levothyroxine can make your heart and blood vessels more sensitive to epinephrine. this can cause the epinephrine to have a much stronger effect on your body than intended.. Serious warnings, pregnancy guidance, and contraindications can differ even when indications overlap.
A table cannot substitute for clinical judgment. Effectiveness, tolerability, drug-drug interactions with your other medications, kidney and liver function, pregnancy status, insurance formulary, and price all feed into a decision that only a licensed prescriber can make responsibly. Data here is sourced from FDA Structured Product Labels (SPL) and FAERS, both of which update as manufacturers and clinicians submit new information. This page is for educational purposes only, is not medical advice, and should not be used to self-switch between epinephrine and levothyroxine - always consult your physician or pharmacist first.
Important: This comparison is for informational purposes only. Drug effects vary between individuals. Always consult your doctor or pharmacist for personalized medical advice.