Statins are used to lower the risk of various heart conditions and stroke.
A health body has shared a warning for some potentially serious side effects.
Britons were urged to be cautious of the effects of aggravating pre-existing myasthenia gravis or bringing the condition on.
This is an auto-immune neuromuscular disorder that weakens muscles across the body.
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Symptoms include drooping eyelids, double vision, problems with chewing and speech disturbance, among others, according to MHRA.
This only occurs in "small numbers" but Britons should seek medical advice if it happens to them.
Many of the symptoms can be alleviated when they stop taking statins, but patients should not do this without speaking to a doctor first.
Statins are used to help prevent heart attacks, stroke and often to lower cholesterol.
Symptoms of Myasthenia are most common in women under 40 and men over 60.
These can be worsened by stress, tiredness as well as when taking medication.
This comes as Britons were warned of missing signs of deadly heart disease.
A new study reported many don't know what their heart rate should be.
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This means they could potentially miss the warning signs of heart disease.
People in the UK have also been warned of "dangerous blind spots" of taking painkillers.
A report found around one third of Britons rely on them weekly.
However, this could be prompting further health conditions.
