Anti-inflammatory painkillers like mefenamic acid are also called non-steroidal anti-inflammatory drugs (NSAIDs), or sometimes just 'anti-inflammatories'. Mefenamic acid is used to treat painful conditions such as arthritis, pain associated with heavy menstrual bleeding, and pain after surgical operations. Sometimes, mefenamic acid consumption can cause allergies whose symptoms include Feeling sick or being sick (vomiting), diarrhoea, skin rash and mouth ulcers. Skin testing is usually done at a doctor's office. A nurse generally administers the test, and a doctor interprets the results. Typically, this test takes about 20 to 40 minutes. Some tests detect immediate allergic reactions, which develop within minutes of exposure to an allergen. Other tests detect delayed allergic reactions, which develop over a period of several days.