The NHS has raised an alert for individuals using levothyroxine to manage their thyroid issues. With around 33 million prescriptions written each year in the UK, this medication is among the NHS’s most frequently prescribed treatments.

Levothyroxine is commonly utilized to treat hypothyroidism, a condition characterized by an underactive thyroid. It is typically administered in either tablet or liquid form, depending on what the general practitioner considers most suitable for the patient.

Despite its widespread effectiveness for those with an underactive thyroid, the NHS warns that levothyroxine may not be appropriate for everyone.

This warning stems from the potential for the drug to exacerbate certain medical conditions. According to the NHS, “Levothyroxine can be taken by most adults and children, but it is not suitable for everyone.”

People who may not be able to take levothyroxine

Per NHS guidelines, there are specific criteria under which levothyroxine should be avoided:

• You have a heart problem, including angina, heart disease or heart failure
• You have a health problem that affects your adrenal glands
• You have previously had a heart attack
• You have an overactive thyroid that produces too much thyroid hormone (thyrotoxicosis)
• You have diabetes
• You have previously had an allergic reaction to levothyroxine or any other medicine
• You have high blood pressure

When to call 999

Levothyroxine is associated with a variety of side effects, some of which may require emergency medical attention. Common side effects include:

• Flushing or sweating
• Feeling restless or excitable
• Trouble sleeping
• Nausea
• Headaches
• Vomiting
• Shaking
• Diarrhoea
• Muscle cramps

Bear in mind that there could be additional side effects linked to levothyroxine not mentioned above. For a comprehensive list of potential side effects, refer to the leaflet included with your medication.

While these common side effects can be uncomfortable, they’re typically not severe and don’t require emergency medical attention. However, if they persist, the NHS recommends consulting a doctor or pharmacist for professional advice.

If you experience a rapid or irregular heartbeat, it’s crucial to contact a doctor or dial 111 immediately. Moreover, if you suffer from chest pains while on levothyroxine, you should call 999 without delay.

Full details on levothyroxine and its side effects can be found on the NHS website here.