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Doctor insights on: Antihistamines Thyroid

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Dr. Erik Borncamp
13 doctors shared insights

Thyroid (Definition)

The thyroid is an endocrine gland that sits in the lower part of the neck. It produces thyroid hormone - which ...Read more


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Do antihistamines mess with you thyroid?

Do antihistamines mess with you thyroid?

Must see an Endo: Need to be seen by an endocrinologist asap. Elevated liver enzymes is not uncommon in individuals with high thyroid levels. Crohns and graves disease are both autoimmune in nature. ...Read more

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I'm due to have a thyroid scan in 3 days. Yesterday, I took two 25 mg antihistamine pills. Will this affect the results?

I'm due to have a thyroid scan in 3 days.  Yesterday, I took two 25 mg antihistamine pills.  Will this affect the results?

No, it should not.: The half life of most antihistamines should be less than 24 hrs and should be out of the system by then. I would check with the radiology center to confirm their policy. I would also avoid any more antihistamines until the time of testing. ...Read more

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Do antihistamines push you hypo or hyper thyroid?

Do antihistamines push you hypo or hyper thyroid?

Neither: Really neither. It will be interesting to know however why the need for anti histamines in the first place as urticaria is common in individuals with autoimmune thyroid disease let it be grave's or hashimoto's disease. ...Read more

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Why can not use antihistamines and decongestants in patient with thyroid disease ? What is the machanism of action? What medicine can use to relief ?

Why can not use antihistamines and decongestants in patient with thyroid disease ? What is the machanism of action? What medicine can use to relief ?

Decongestants may: Decongestants may complicate and exacerbate hyperthyroid states. In general I do not recommend oral decongestants to any age group as there is a higher risk of cardiovascular disease with decongestant use. Antihistamines alone may be used in thyroid disease in general. ...Read more

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On antihistamine and sinus medications it says to consult your doctor if you have thyroid disease. Why?

On antihistamine and sinus medications it says to consult your doctor if you have thyroid disease. Why?

Avoid stimulants: Many otc cold medicines have pseudophed or similar stimulant medications. If you are hyperthyroid, this would be an added stimulant. If your heart rate is already 95 from your thyroid, the added stimulant could be bad for your heart. However, if your thyroid is being treated, and your blood ft4 is normal, you are probably ok. ...Read more

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Don't understand how antihistamines work for chronic hives that is due to thyroid issues and not allergies?

Don't understand how antihistamines work for chronic hives that is due to thyroid issues and not allergies?

Chronic Urticaria CU: CU can be associated with various autoimmune disorders. Even in the absence of hypo- or hyperthyroidism, patients with thyroid autoantibodies are often poorly responsive to standard therapies and have more persistent disease. Studies have examined the use of thyroid supplementation in the treatment of CU, with mixed results. Best treatment for this condition is daily antihistamines. See Allergist. ...Read more

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I see a lot of antihistamine and sinus medications that says to consult your doctor if you have thyroid disease. What is the reason for this?

I see a lot of antihistamine and sinus medications that says to consult your doctor if you have thyroid disease. What is the reason for this?

Thyroid disease: The concern is for those patients who have hyperthyroidism. These medications can cause hypertension and high blood pressure and hypethyroidism can too. They would each make these symptoms worse. ...Read more

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Can chronic autoimmune urticaria go into remission? Will taking levothyroxine for thyroid help stop the hives without taking antihistamines?

Can chronic autoimmune urticaria go into remission? Will taking levothyroxine for thyroid help stop the hives without taking antihistamines?

Yes: The average duration of chronic hives lasts for 5-6 years and thus remission is indeed possible. As for thyroid, I have only had one patient with thyroid antibodies benefited from thyroid replacement out of the many hundreds I have seen over the years. Usually antihistamine would be needed. Studies so far with thyroid replacement have mostly been negative. ...Read more

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Itch all over no rash. Antihistamines and creams no effect. Bloods clear for kid, lib, thyroid. Soap free shower. Scratching. Gbs '09 i had this too ?

Itch all over no rash. Antihistamines and creams no effect. Bloods clear for kid, lib, thyroid.  Soap free shower. Scratching. Gbs '09 i had this too ?

Many possibilities: To help you some additional questions to answer: 1) any travel to outside of us or snorkeling/scuba activity? Some parasites, infections can manifest this way. 2) understand no soap being used - but chemicals are everywhere. Anything new that you are being exposed to? 3) sexually active? Pregnancy, std can cause these symptoms as well 4) psychological factors? Anxiety, depression, ocd, etc. ...Read more

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A small neck rash a few days prior to getting a full body rash very quickly. Appears in a.M. Before foods or meds. Clears fast with no antihistamine?

A small neck rash a few days prior to getting a full body rash very quickly.  Appears in a.M. Before foods or meds. Clears fast with no antihistamine?

Urticaria: Urticaria refers to a group of disorders affecting adults and children, in which red patches and weals occur in the skin. A wheel is a swelling of the surface skin. The skin swelling seen in urticaria is due to the release of chemicals such as histamine from mast cells in the skin which causes small blood vessels to leak. Treatment is with antihistamine or avoidance of the causative agent. ...Read more

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I have an itchy red rash covering most of my torso and neck. My GP gave me antihistamines, how soon should I see a reduction in the rash?

I have an itchy red rash covering most of my torso and neck. My GP gave me antihistamines, how soon should I see a reduction in the rash?

Depends: if it is an allergic reaction, you took the right dose, it would fade in few hours, but might recur, if it something else other than allergy, it needs to be treated accordingly ...Read more

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I have welts on my neck after resting my head on a wool pillow. My upper lip is also swollen. I am taking over-the-counter antihistamines.?

I have welts on my neck after resting my head on a wool pillow. My upper lip is also swollen. I am taking over-the-counter antihistamines.?

Allergy?: Could be an allergy to wool, especially if antihistamines are helping. But hives and swelling could be due to a variety of things including food allergy, medication alley, insect sting, viral infection, or exposure related allergy like the wool. If not improving in a few days see doc ...Read more

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Raised red rash around arm pits (not in pit) and front of neck. Bumps/welts no pus or blisters. Doesn't respond to antihistamines. Began mid April.

Raised red rash around arm pits (not in pit) and front of neck. Bumps/welts no pus or blisters. Doesn't respond to antihistamines. Began mid April.

See your doctor: or dermatologist, more history and physical examination are needed to reach a diagnosis, hence the right treatment, cannot be done with sketchy picture and limited platform ...Read more

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I have a non itchy rash all over body, on my arms. Legs, stomach, back chest and neck. I have been prescribed a steroid cream and antihistamines. I've been using these for two weeks but the rash has got worse. What could this be?

I have a non itchy rash all over body, on my arms. Legs, stomach, back chest and neck. I have been prescribed a steroid cream and antihistamines. I've been using these for two weeks but the rash has got worse. What could this be?

Needs re-evaluation: Not possible to diagnose without at least a picture, you need to see your doctor again who would refer you to a dermatologist. Please hold the steroid cream for now, it could be a fungal rash or something else, good luck ...Read more

Benadryl (Definition)

Diphenhydramine is a sedating antihistamine which is a kind of antihistamine type drug (common ...Read more


Dr. Paul Carter
630 doctors shared insights

Antihistamine (Definition)

Sedating and non-sedating antihistamines prevent and treat allergic reactions, and are ...Read more