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Underactive thyroid

Underactive thyroid, also known as hypothyroidism, is a condition where the thyroid gland does not produce enough of the thyroxine hormone in the body.

  1. Can cause fatigue and weight fluctuations
  2. Left untreated can lead to complications
  3. Medicated with hormone replacement

You can renew your existing prescription for underactive thyroid treatment with our secure online clinic service. We work with GMC-registered doctors and a UK dispensing pharmacy.

  • UK prescribers
  • 24 hour delivery
  • Secured payment

2 product result(s) for Underactive thyroid

Thyroid function lab test kit

Thyroid function lab test kit

  1. Measures levels of thyroid hormone
  2. Uses a blood sample
  3. Analysis at our partner lab
SELFCheck Thyroid Health Test

SELFCheck Thyroid Health Test

  1. Suitable for men and women
  2. Can detect an underactive thyroid
  3. Effective when used correctly


  1. Effective thyroxine replacement
  2. Reduces symptoms of underactive thyroid
  3. Simple tablet or oral solution


  1. Simple tablet treatment
  2. Available in two strengths
  3. Reduces symptoms of hypothyroidism


  1. Tablet treatment
  2. Used in underactive thyroid
  3. Helps to alleviate symptoms

Underactive thyroid is a condition which affects around one in 1,000 men and 15 in 1,000 women in the UK, according to the NHS. It is characterised by a low production of thyroxine by the thyroid gland, which can cause a range of symptoms including fatigue, weight gain and muscle cramps.

The condition, also known as hypothyroidism or thyroid hormone deficiency, can often be the result of the immune system wrongly attacking the thyroid gland, or a thyroid illness. This causes it to produce less thyroxine, a hormone the body needs to help it convert fat into energy. When levels of this hormone fall, the body’s faculties consequently slow down, and this can lead to symptoms such as lethargy, dry skin, sensitivity to cold, muscle aches and cramps, loss of libido, irregular periods, or constipation.

Diagnosis is carried out via a blood test. Through this, a doctor can measure how much of the hormone is present in the blood.

Levothyroxine is a common treatment for underactive thyroid. It contains a synthetic version of the hormone the thyroid produces, and helps to supplement levels in those where production of this hormone is low. This helps to offset the symptoms of hypothyroidism.

After a starting dose of this drug has been issued, a doctor will usually continue to undertake blood tests at certain intervals in order to monitor the levels of thyroxine in the patient’s body. This will help them to determine an appropriate maintenance dose.

We provide underactive thyroid treatments Levothyroxine and Eltroxin through our online pharmacy service, but only to patients who are already taking them under the supervision of their doctor.

Please note that you will still need to have regular thyroid function tests with your doctor, to ensure that the medication you are taking is working.

To renew your prescription for your hypothyroidism treatment, select your medicine and take our questionnaire. Each order is reviewed by a doctor, who will issue an e-prescription once approved. This will then sent to our UK pharmacy to be dispensed, and then shipped by tracked next-day courier.

Page last reviewed:  26/04/2022
Types of Treatment

Levothyroxine is the treatment commonly issued for underactive thyroid. It is available as a branded medicine marketed by Mercury, Eltroxin, and as a generic medicine made by a number of different manufacturers, including Actavis.

Given in tablet form, this drug is available in 25, 50 or 100 microgram doses.

Suspension fluid forms are also available.

How do they work?

These tablets work by supplementing the hormone which is being underproduced by the thyroid gland, thyroxine. In doing so, it helps to prevent symptoms which result from a deficit of this hormone, which plays a vital part in the process of energy conversion in the body.

What are the side effects?

Several side effects have been associated with the use of this medicine although not everyone will get them. These include (but are not limited to) headache, flushing and weight loss.

Can I take them with other medications?

It depends which other treatments you are using. There are many possible contraindications listed in the clinical information for this item, so you should let your doctor know about any other prescription, non-prescription or remedial items you are taking during consultation.

Page last reviewed:  26/04/2022
Question and Answers

What’s the difference between the medications?

One is a branded treatment (Eltroxin) and one is a generic. Branded medicines are always made by the same manufacturer, whereas generics might be made by several. They contain the same active ingredients, and are clinically bio-equivalent.

Should I take Levothyroxine or Eltroxin?

It depends on whether or not your doctor thinks it is suitable. Let your prescriber know about any medical conditions you have during consultation. There are a range of health factors to consider, and you can find out more about these on the product information page. Regular testing and monitoring with your GP is also necessary when taking this treatment.

Are there different side effects?

The side effects associated with Levothyroxine are the same, no matter which pharmaceutical company makes it, as it is subject to the same manufacturing conditions. You can find out more about side effects on the respective product pages.

Is it right for me?

If you are experiencing the symptoms of hypothyroidism for the first time, you should make an appointment with your GP. After monitoring your thyroid function through various tests, they will be able to diagnose the condition and help you determine which treatment is most suitable.

If you are seeking to renew your existing prescription for thyroid treatment, you can do so through our online service. Take our questionnaire, and one of our GMC-registered doctors will assess your responses. Once approved, they will issue an e-prescription, which will then be fulfilled at our UK-based pharmacy. Medicines are shipped by next-day express parcel.

Page last reviewed:  26/04/2022

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We promise to keep your details secure and private. We will never sell your information or share it with third parties. Whatever treatment you buy online from us, we will send in plain, unmarked packaging via our secure courier service.

Delivery on all items is included in the price. After your order has been dispatched, you’ll be supplied with a tracking number, allowing you to follow the progress of your items every step of the way. We deliver to anywhere in the UK, so whether you’re in London, Birmingham, Manchester, Glasgow or Cardiff, your order will be at your door within just 24 hours of approval from our doctor.

This content was reviewed by a clinician on

26 April 2022
dr daniel

Dr Daniel Atkinson

(GP Clinical Lead - GMC No. 4624794) 26 April 2022
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