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Doctor insights on: Adrenaline Cardiac Epinephrine Heart Synthroid Thyroxine

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Taking Synthroid (thyroxine) 125 and felt a sudden adrenaline rush on my heart. Should I be worried?

Taking Synthroid (thyroxine) 125 and felt a sudden adrenaline rush on my heart. Should I be worried?

Don't know: What a sudden adrenaline rush is. If you're taking your medication properly and your levels are normal, there is no relationship to your thyroid pills. ...Read more

Dr. Sheila Smith
465 Doctors shared insights

Adrenaline (Definition)

Adrenalin (e) / Epinephrine is the hormone produced by the adrenal medulla that speeds and strengths the heart, dilates the airways, and shifts blood flow to the muscles. Often this is in response ...Read more


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Been on armour for two months was on synthyroid for 20 yrs, feeling better but certain days I feel like I'm on an adrenaline rush, heart rate 95bpm?

Been on armour for two months was on synthyroid for 20 yrs, feeling better but certain days I feel like I'm on an adrenaline rush, heart rate 95bpm?

Thyroid replacement: This is why most endocrinologists don't use armour. It contains a mixture of hormones, and often does makes you hyperthyroid. And it is hard to follow the blood tests. ...Read more

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How long can epinephrine affect your heart?

How long can epinephrine affect your heart?

A few minutes: The half-life of Epinephrine is about 2 minutes. We constantly release small amounts. This is increased by the "fight or flight" reflex, and when administered medically. The most common use is in local anesthesia, and the effects wear off quickly. ...Read more

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Why does epinephrine increase heart rate?

Why does epinephrine increase heart rate?

Binding receptors: Do you mean how does it increase heart rate? The mechanism of action is quite complicated but in simple term, it binds to the beta adrenergic receptors on the heart leading to changes in calcium level and increases in the firing rate of the pacemaker cells. ...Read more

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Could too much Synthroid (thyroxine) cause heart block?

Could too much Synthroid (thyroxine) cause heart block?

Thyroid: Too much synth rood would usually cause too rapid a heart rate. In an occasional patient the tachycardia could have some av block associated. Too little thyroid would be a more common cause of block. ...Read more

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Can levoxyl (thyroxine) cause heart burn if you take it and lay down?

Can levoxyl (thyroxine) cause heart burn if you take it and lay down?

Depends.: Levoxyl (thyroxine) does not cause irritation to the stomach. But it depends on what you took it with and how soon after taking it, unless it was with a small sip of water. It is always best to wait 45 minutes to 1 hour before lying down after significant water intact, or eating. ...Read more

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Is it normal to be in a coma have a heart attack caused by thyroxine overdose?

Is it normal to be in a coma have a heart attack caused by thyroxine overdose?

No: None of the items, coma, heart attack or thyroxine overdose are normal. Thyroxine overdose may cause the other two. ...Read more

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The dentist may use anesthetic such as 0.3ml lidocaine with 1:100, 000 epinephrine. Would this interact/ have problems with my heart or BP medication.

The dentist may use anesthetic such as 0.3ml lidocaine with 1:100, 000 epinephrine. Would this interact/ have problems with my heart or BP medication.

Little concern: Stress form the procedure, particularly if you were not numb, would cause your body to release more Epinephrine then what is in the local anesthetic.
That said I do try to error on the side of caution depending on the heart condition by not using the maximum dose (approximately 8 full injections) and breaking up multiple procedures over several appointments. ...Read more

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Can you tell me how halothane sensitizes the heart to epinephrine?

Can you tell me how halothane sensitizes the heart to epinephrine?

It blocks: potassium channels. I doubt you will find Halothane anymore in any US operating room ...Read more

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Why would epinephrine cause heart palpitations?

Why would epinephrine cause heart palpitations?

That's it's job: Epinephrine is supposed to increase heart rate, blood pressure and the force of contraction. That's what palpations are. ...Read more

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Should I inject someone with an epipen (epinephrine) if that person has no heart beat?

Should I inject someone with an epipen (epinephrine) if that person has no heart beat?

Depends: If a person is having anaphylactic shock, their blood vessels may suddenly dilate.

This can cause their blood pressure to drop, sometimes quite considerably.

If the blood pressure is too low, the pulse may not be able to be felt; the heart is, however, still beating in this case.

If a person is having anaphylactic shock, they need emergent treatment. ...Read more

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Can skipping my Synthroid (thyroxine) a lot due to forgetfulness cause heart issues?

Can skipping my Synthroid (thyroxine) a lot due to forgetfulness cause heart issues?

Usually not: If you have had no heart issues before. Get a 7 day pill box and if the next week you find you've forgotten to take the pills (thyroxine) tuesday or thursday, etc. - just take them before filling it up again. ...Read more

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What would be the problem causing chest pain and irregular heart beat while taking synthroid (thyroxine)? Can it cause mi?

What would be the problem causing chest pain and irregular heart beat while taking synthroid (thyroxine)? Can it cause mi?

See Below: Any chest pain needs to be investigated by a physician to rule out cardiac origin. Synthroid (thyroxine) may cause tachycardia or irregular heart beats if the dose of the medication is higher that what the patient needs. That is why thyroid functions tests need to be done while on Synthroid (thyroxine) to make sure that the dose is adequate. ...Read more

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How does epinephrine affect the heart?

Epinephrine: Epi causes both blood vessel constriction and increased force of contraction. It usually also increases the rate of contraction. It usually increases blood pressure and cardiac output. These are acute effects. ...Read more

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Epinephrine -- does it's use cause a heart attack or stroke?

Epinephrine -- does it's use cause a heart attack or stroke?

Maybe: There is too much of a good thing. Epinephrine is a natural hormone with necessary functions. Too much can, and does, cause heart attack, hypertension, anxiety, stroke. Aside from exogenous sources, few natural conditions cause excess Epinephrine (eg, pheochromocytoma). ...Read more

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Can novacaine cause a heart attack? What are the side effects of epinephrine?

Novacaine heart att: Novacaine can cause heart problems if it is overdosed. Will decrease the absorption of the novacaine into your blood, but it to can cause heart problems when injected directly into the blood stream.

A heart attack happens when the oxygen consumption in the heart exceeds the blood supply to a section of heart. This is more likely to happen whith an unintended bloodstream injection of epinephrine. ...Read more

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What does gait weakness mean? Also, any idea what would cause elevated epinephrine levels and heart rates that race multiple times a night and races at the slightest movement?

What does gait weakness mean? Also, any idea what would cause elevated epinephrine levels and heart rates that race multiple times a night and races at the slightest movement?

Pheochromocytoma: A pheochromocytoma is a growth in the area of the adrenal glands that causes hypertension, elevated catecholamine levels and palpitations. It is not a common condition and an endocrinologist is best qualified to evaluate for one and I recommend that you consult one in view of your symptoms. He/she will order the appropriate tests and refer you to a cardiologist if it is deemed advisable. ...Read more

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How high does epinephrine have to be to be considered a pheochromocytoma? Also, I have attacks multiple times a night (every night) with heart rates as high as 174bpm. Used to have episodes of nausea,

How high does epinephrine have to be to be considered a pheochromocytoma? Also, I have attacks multiple times a night (every night) with heart rates as high as 174bpm. Used to have episodes of nausea,

This question is: Really complex, and I am concerned that an answer may only make things more confusing if it is too specific. I think in situations like this a thorough history and physical by an internal medicine doctor and possibly a second opinion would be a great way to shed light on something that seems foggy. Pheochromocytoma is truly rare. There are common things that should be looked into first. Best 2 U. ...Read more

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I forgot my Synthroid (thyroxine) for three days could that cause me to have rapid heart rate at 3 am? I take 112 mcg 6 days a wk. No thy gland. Almost went to ER

I forgot my Synthroid (thyroxine) for three days could that cause me to have rapid heart rate at 3 am? I take 112 mcg 6 days a wk. No thy gland. Almost went to ER

Yes: Taking too much Synthroid (thyroxine) could give you palpitations. Excessive sweating, insomnia and alterations in skin sensation can occur as well. See your primary or endocrinologist, they need to repeat a TSH, T3 and T4. ...Read more

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What makes heart rate increase during exercise besides epinephrine?

What makes heart rate increase during exercise besides epinephrine?

Many factors: Humidity, altitude, oxygen tension, thermal are just a few examples. Dehydration as well as increasing the core body temp are very influential on raising your heart rate. How good your fitness level is also important. ...Read more

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If I was not compliant with taking Synthroid (thyroxine) will heart pills like amiodarone make me feel worst?

Yes: In general, not taking medications that were prescribed to you in the way they were prescribed is not healthy. Sometimes this will not make you feel bad (cholesterol medicine, eg), but other times like with levothyroxine (synthroid), this will leave you hypothyroid, which can make you feel tired, constipated, cold, depressed, etc. This is irrespective of whether you were compliant with amio or not. ...Read more

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I've been off my Synthroid (thyroxine) 50 mcg for three weeks now will I go into a coma or something? Will it damage my heart? I am starting meds again soon

I've been off my Synthroid (thyroxine) 50 mcg for three weeks now will I go into a coma or something? Will it damage my heart? I am starting meds again soon

Please restart: Your dose suggests that you have mild to moderate low thyroid. Without your medication you could expect weight gain, hair loss, constipation, depression, feeling cold, and feeling lethargic. In cases of severely low thyroid, coma and heart damage can occur.
This is not you now, but please restart your medication. ...Read more

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What does ER do if a patient with heart disease and tachycardia has anaphylaxis shock? Do they still give epinephrine injection?

What does ER do if a patient with heart disease and tachycardia has anaphylaxis shock? Do they still give epinephrine injection?

Usualloy yes.: Tachycardia is frequently caused by anaphylaxis. The only drug that truly treats the condition is epinephrine. Therefore, the drug should still be used in patients with heart disease. However, a good way of reducing the danger from the medication is to give lower initial doses, e.g. A pediatric dose of 0.15mg im, which can be repeated every 10 minutes as necessary. ...Read more

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Can't use epinephrine I get rapid heart rate, endodontist wants to give me 20 mg Valium crushed 1/2 hour before root canal. Is this ok?

Can't use epinephrine I get rapid heart rate, endodontist wants to give me 20 mg Valium crushed 1/2 hour before root canal. Is this ok?

Epinephrine: After over 40 years of dental practice I have had only a handful of patients who truly are sensitive to Epinephrine in local anesthetics. Almost all patient who say they react with an increased heart rate do so because of the release of their own epi due to anxiety, or react from poor injection technique. Ask your dentist about the use of sweet air instead of valium. Btw ok with precautions. ...Read more

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My father just passed away with third degree heart block. Is this hereditary? Just has calcium score 0. No meds; Synthroid (thyroxine) only - gland removed.

My father just passed away with third degree heart block. Is this hereditary? Just has calcium score 0. No meds; Synthroid (thyroxine) only - gland removed.

3rd degree AV block: Conduction system (electrical system) disease can be hereditary. You need to monitor with at least an ECG a year and report to your doctor if you feel faint or dizzy. ...Read more

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Started Synthroid (thyroxine) 7/18, TSH was 9.19 retest 9/26 TSH 11.25 after starting Synthroid (thyroxine) breathing difficulties & rapid heart, doc wants to up synth to 88?

Started Synthroid (thyroxine) 7/18, TSH was 9.19 retest 9/26 TSH 11.25 after starting Synthroid (thyroxine) breathing difficulties & rapid heart, doc wants to up synth to 88?

Thyroid problem: You may be having more than a thyroid problem, e.g. Female hormone imbalance or other. Ask for complete hormone testing and also more thyroid tests e.g. Free t4, free t3. You may not be converting the synthroid (thyroxine) which is T4 to the biologically active t3. Probably should ask for consultation with specialist e.g. Endocrinologist. ...Read more

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My TSH levels are at a 4.25. I am currently taking 50mcg of synthroid (thyroxine). My doctor upped my dose to 75mcg. I am afraid of side effects like racing heart?

My TSH levels are at a 4.25. I am currently taking 50mcg of synthroid (thyroxine). My doctor upped my dose to 75mcg. I am afraid of side effects like racing heart?

Take it: Adjusting a thyroid medicine is both an art and science. You need to be "euthryroid" meaning normal tsh, t3, (liothyronine) T4 and must feel well as the normal range is made for a population and not your particular body. Fine adjustments must be made between you and a trusted doctor with an aim to make you feel well and healthier and avoid side effects such as palpitations. So go slow. ...Read more

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Can hypothyroid symptoms be fast heart rate and insomnia? Will adding cytomel to Synthroid (thyroxine) help?

Can hypothyroid symptoms be fast heart rate and insomnia? Will adding cytomel to Synthroid (thyroxine) help?

Maybe hyperthyroid: Hyperthyroidism (too much circulating thyroid hormone) will often produce rapid heart rate and insomnia - along with other symptoms like diarrhea, weight loss, and jitteriness. Low thyroid may cause weight gain, sluggishness, coarse/dry skin, and constipation. Ask your care provider about your symptoms. Please do not "freelance" with Cytomel or synthroid, (thyroxine) as this may harm you! Lgromko md. ...Read more

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Diagnosed with graves. On l-thyroxine, but still have all symptoms. Main symptom is heart palpitations. What could this be? See med notes, please.

Diagnosed with graves. On l-thyroxine, but still have all symptoms. Main symptom is heart palpitations. What could this be? See med notes, please.

Go follow up with: Your primary dr and endocrinologist. Your symptoms could be from the residual effect of your graves' disease and/or side effect of your thyroid hormone. Have an ekg to be sure you don't have irregular heart beat asap. The dose needs to be adjusted based on your tsh. Hope you feel better! ...Read more

Dr. Austina Cho
5 Doctors shared insights

Cardiac (Definition)

Cardiac translates literally to "heart, " and any place the term is seen, such ...Read more


Dr. Mohammad Shahzad
1,004 Doctors shared insights

Epinephrine (Definition)

Epinephrine is a rhythm control agent which is a ...Read more