If you're diagnosed with a subarachnoid haemorrhage or a diagnosis is strongly suspected, you'll usually be transferred to a specialist neurosciences unit.

These units have a range of equipment and treatments to support many of the body's vital functions, such as breathing, blood pressure and circulation.

In more severe cases, you may be transferred to an intensive care unit (ICU).

The treatments you may have are described below.



One of the main complications of a subarachnoid haemorrhage is secondary cerebral ischaemia.

This is where the supply of blood to the brain becomes dangerously reduced, disrupting the normal functions of the brain, causing brain damage.

You'll usually be given a medication called nimodipine to reduce the chances of this happening.

This is normally taken for 3 weeks, until the risk of secondary cerebral ischaemia has passed.

Side effects of nimodipine are uncommon, but can include:

  • flushing
  • feeling sick
  • increased heart rate
  • headaches
  • a rash

Pain relief

Medication can be effective in relieving the severe headache pain associated with a subarachnoid haemorrhage.

Commonly used pain-relieving medications include morphine and a combination of codeine and paracetamol.

Other medications

Other medications that may be used to treat a subarachnoid haemorrhage include:

  • anticonvulsants, such as phenytoin – which may be used to prevent seizures (fits)
  • antiemetics, such as promethazine – which can help stop you feeling sick and vomiting

Surgery and procedures

If scans show that the subarachnoid haemorrhage was caused by a brain aneurysm, a procedure to repair the affected blood vessel and prevent the aneurysm from bleeding again may be recommended.

This can be carried out using one of two main techniques.

Neurosurgical clipping

Neurosurgical clipping is carried out under general anaesthetic, meaning you'll be asleep throughout the operation.

A cut is made in your scalp (or sometimes just above your eyebrow) and a small flap of bone is removed so the surgeon can access your brain. This type of operation is known as a craniotomy.

When the aneurysm is located, the neurosurgeon (an expert in surgery of the brain and nervous system) will seal it shut using a tiny metal clip that stays permanently clamped on the aneurysm.

After the bone flap has been replaced, the scalp is stitched together.

Over time, the blood vessel lining will heal along where the clip is placed, permanently sealing the aneurysm and preventing it growing or rupturing again.

Endovascular coiling

Endovascular coiling is also usually carried out using general anaesthetic. The procedure involves inserting a thin tube called a catheter into an artery in your leg or groin.

The tube is guided through the network of blood vessels into your head and into the aneurysm.

Tiny platinum coils are then passed through the tube and into the aneurysm. Once the aneurysm is full of coils, blood can't enter it.

This means the aneurysm is sealed off from the main artery, preventing it growing or rupturing again.

Coiling versus clipping

Whether clipping or coiling is used depends on things such as the size, location and shape of the aneurysm.

Coiling is often the preferred technique because it has a lower risk of short-term complications like seizures than clipping, although the long-term benefits over clipping are uncertain.

People who have the coiling procedure usually leave hospital sooner than people who have the clipping procedure, and the overall recovery time can be shorter.

But when these types of surgery are carried out as an emergency procedure, your recovery time and hospital stay depend more on the rupture's severity than the type of surgery used.

Page last reviewed: 14/01/2016
Next review due: 01/01/2019