Myasthenia Gravis: A Care Staff Guide to Safe Support

Myasthenia gravis is a long-term autoimmune condition that causes muscle weakness, especially after activity, which improves with rest. It can affect the eyes, face, speech, swallowing, breathing and the limbs. For care and health staff, three things matter most: knowing how it presents, recognising when it becomes an emergency, and knowing that certain common medicines can make it worse. This guide draws on NHS information and NHS Scotland medicines guidance. It is general information, not clinical advice.

What myasthenia gravis feels like

The NHS lists a wide range of symptoms. Around the eyes and face they include droopy eyelids in one or both eyes, double vision and difficulty with facial expressions. Affecting speaking, chewing and swallowing, they include slurred speech, a quiet, husky or nasal voice, difficulty chewing and swallowing, and choking or accidentally inhaling food. The NHS also lists shortness of breath, particularly when lying down or after exercise, and weakness in the limbs that makes lifting, standing, climbing stairs and personal care difficult, sometimes with a waddling walk and aching after use.

The defining feature is variability. The NHS says weakness tends to be worse when a person is tired and better after rest. A person may seem fine in the morning and struggle by evening, or manage a short walk but not a long one. This fluctuation can lead staff to doubt the person, or to read symptoms as laziness or anxiety. It is important to take reports of weakness seriously and to record patterns through the day.

Triggers that can worsen symptoms

The NHS notes that symptoms can be triggered by stress, infections and certain medicines. Infections deserve special attention in care settings: a chest or urine infection may bring on a marked worsening, so staff should report any signs promptly. Our guide to sepsis recognition and management explains how to spot deterioration early.

Myasthenic crisis: call 999

The NHS says to call 999 for an ambulance immediately if there are worsening severe breathing or swallowing difficulties, because the person may need emergency hospital treatment. This is known as a myasthenic crisis. Warning signs include increasing breathlessness, a weak or ineffective cough, difficulty clearing saliva, voice changes and rapidly worsening weakness. Staff should not wait to see whether symptoms settle, and they should tell the ambulance crew that the person has myasthenia gravis.

Medicines that can make it worse

NHS Scotland guidance lists several medicine classes that may worsen myasthenia gravis. These include some antibiotics (such as aminoglycosides, macrolides, quinolones and tetracyclines), some heart and blood pressure medicines (including beta-blockers, calcium channel blockers and some anti-arrhythmics and diuretics), and some nervous system medicines such as benzodiazepines, antipsychotics, tricyclic antidepressants and anti-epileptics. Strong opioids, antimuscarinics and sedating antihistamines also appear on the list. The guidance advises that medicines in the highest-risk categories should be avoided unless there is no alternative and specialist advice has been sought, and that people taking medicines in the caution category should be monitored.

It also says that patients and doctors should be alert to early signs of an exacerbation when a new medicine is started, and it warns about harmful polypharmacy and a higher risk of adverse reactions in people with several conditions or frailty. For staff, this means:

• Make sure every prescriber, pharmacist and out-of-hours service knows the person has myasthenia gravis.
• Do not give over-the-counter medicines, including some cold and allergy remedies, without checking; see our guide to homely remedies protocols.
• Watch for new weakness, breathing or swallowing change in the days after any new medicine is started and report it straight away.
• Make sure medicines errors, near misses and look-alike drug risks are taken seriously; see look-alike, sound-alike medication safety.

Supporting daily life

Practical help is mostly about energy and safety. Plan demanding tasks for when the person is strongest, build in rests, and offer softer or smaller meals if chewing tires them. If swallowing is affected, ask for a speech and language therapy assessment and follow the swallowing advice carefully. Sit the person upright for meals, allow time, and stop if they tire or cough. Eye symptoms, such as double vision, may make reading and walking harder, so lighting and clear walkways matter.

Frequently asked questions

Is myasthenia gravis the same as muscular dystrophy?

No. Myasthenia gravis is an autoimmune condition affecting nerve-to-muscle signalling, with weakness that varies through the day. Muscular dystrophies are inherited conditions with a different course.

Should a person with myasthenia gravis avoid exercise?

Not necessarily, but activity should be paced and guided by their specialist team.

What training should staff do?

Medicines safety, recognising deterioration and swallowing safety are all relevant. Browse the Learnsignal CPD hub for healthcare compliance courses.

Sources: NHS, Myasthenia gravis symptoms; NHS Scotland guidance on medicines that may affect people with myasthenia gravis or Lambert-Eaton myasthenic syndrome. This article is general information, not medical advice.