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Are There Any Drug Interactions Between Diphenhydramine And Thyroid Medicine?

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Posted on Sat, 12 Nov 2016
Question: Good evening I have hasmito disease and can not sleep. I have been taking high doses of valerian but due to stress this is no longer working. I have read the diphenhydramine can react with your medicine! Is this true XXXXXXX have always referred to this medicine when in need but as many tsh has been recently out of wack and I have just got the level back I wouldn't like to upset the balance again.
Thank you kindly
doctor
Answered by Dr. Shehzad Topiwala (35 minutes later)
Brief Answer:
No

Detailed Answer:
To my knowledge there is no known direct interaction between diphenhydramine and thyroid medicine.
Although, it is important that you take your thyroid medication 60 minutes prior to breakfast in the morning, with water, on an empty stomach. This means that it has to be taken 60 minutes before any other medications.
Sorry to learn about your bothersome symptoms. When I see someone like you in my practice, I typically order the following blood tests in addition to a detailed physical examination:

CBC (Complete Blood Count, also known as Hemogram; includes Hemoglobin, WBC and Platelet counts)
Electrolytes (Sodium and Potassium in particular)
HbA1c (Glycosylated Hemoglobin = your last 3 months' glucose average). Also known by other names such as GlycoHemoglobin or Glycated Hemoglobin or A1c
Liver function tests (SGOT , SGPT, Albumin, Bilirubin, Alkaline Phosphatase)
Kidney function tests (BUN, Creatinine)
TSH (checks your thyroid)
Free T4 (this too checks your thyroid) Thyroid autoantibodies : Anti Thyroid Peroxidase (TPO) antibodies and Anti Thyroglobulin antibodies
25 hydroxy Vitamin D levels (ideal range 40 to 60 ng/ml = 100 to 150 nmol/liter)

None of these tests require any fasting and can be done at any time of the day Correct diagnosis and treatment requires the opportunity to examine the patient so you must see an endocrinologist in-person.
Note: For more information on hormonal imbalance symptoms or unmanaged diabetes with other comorbid conditions, get back to us & Consult with an Endocrinologist. Click here to book an appointment.

Above answer was peer-reviewed by : Dr. Chakravarthy Mazumdar
doctor
Answered by
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Dr. Shehzad Topiwala

Endocrinologist

Practicing since :2001

Answered : 1663 Questions

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Are There Any Drug Interactions Between Diphenhydramine And Thyroid Medicine?

Brief Answer: No Detailed Answer: To my knowledge there is no known direct interaction between diphenhydramine and thyroid medicine. Although, it is important that you take your thyroid medication 60 minutes prior to breakfast in the morning, with water, on an empty stomach. This means that it has to be taken 60 minutes before any other medications. Sorry to learn about your bothersome symptoms. When I see someone like you in my practice, I typically order the following blood tests in addition to a detailed physical examination: CBC (Complete Blood Count, also known as Hemogram; includes Hemoglobin, WBC and Platelet counts) Electrolytes (Sodium and Potassium in particular) HbA1c (Glycosylated Hemoglobin = your last 3 months' glucose average). Also known by other names such as GlycoHemoglobin or Glycated Hemoglobin or A1c Liver function tests (SGOT , SGPT, Albumin, Bilirubin, Alkaline Phosphatase) Kidney function tests (BUN, Creatinine) TSH (checks your thyroid) Free T4 (this too checks your thyroid) Thyroid autoantibodies : Anti Thyroid Peroxidase (TPO) antibodies and Anti Thyroglobulin antibodies 25 hydroxy Vitamin D levels (ideal range 40 to 60 ng/ml = 100 to 150 nmol/liter) None of these tests require any fasting and can be done at any time of the day Correct diagnosis and treatment requires the opportunity to examine the patient so you must see an endocrinologist in-person.