The most common side effects with Arava (seen in between 1 and 10 patients in 100) are leucopenia (low white blood cell counts), mild allergic reactions, anorexia (loss of appetite), weight loss, headache, dizziness, paraesthesia (abnormal skin sensations), mild increase in blood pressure, diarrhoea, nausea (feeling sick), vomiting, inflammation of the mouth such as mouth ulcers, abdominal (tummy) pain, increased liver enzyme levels, hair loss, eczema, dry skin, rash, pruritus pruritus (itching), tenosynovitis (inflammation of the sheath surrounding a tendon) and asthenia (weakness).