Nebulisers are machines that turn the liquid form of your short-acting bronchodilator medicines into a fine mist, like an aerosol. You breathe this in with a face mask or a mouthpiece. Nebulisers are no more effective than normal inhalers. However, they are extremely useful in people who are very tired (fatigued) with their breathing, or people who are very breathless. Nebulisers are used mainly in hospital for severe attacks of COPD when large doses of inhaled medicines are needed. They are used less commonly than in the past, as modern spacer devices are usually just as good as nebulisers for giving large doses of inhaled medicines. You do not need any co-ordination to use a nebuliser - you just breathe in and out, and you will breathe the medicine in.
Acute pain is often felt soon after injury, and is of short duration. Most people who have surgery have moderate or severe pain afterwards. Painkillers (analgesics) are tested in people with pain, often following the removal of wisdom teeth. Study participants have to have at least moderate pain levels and the pain is usually treated with painkillers taken by mouth. This overview is useful mainly for acute pain lasting only a few days or weeks, and not for chronic pain lasting for many months. For this overview we have not included information from reviews on migraine, tension headache, or period pain.