You should not take Nurofen Meltlets Lemon if:
  you have had an allergic reaction to aspirin, ibuprofen or any of the ingredients listed above, you have had a worsening of asthma, allergic rash, or on itchy, runny nose when taking ibuprofen, aspirin or similar medicines, you have or have ever had a stomach ulcer,  you have phenylketonuria or are intolerant to phenylalanine, each tablet contains aspartame equivalent to 8.4mg phenylalanine, you are under 12 years of age.

Each tablet contains the active ingredient Ibuprofen Ph. Eur. 200mg. Also contains: Mannitol, ethylcellulose, aspartame, croscarmellose sodium, silicon dioxide, hypromellose, flavour (flavours, maltodextrin), magnesium stearate.

Nurofen Meltlets Lemon are generally well tolerated by the majority of people, however, the following side effects may occur:
stomach discomfort or pain, nausea, stomach ulcer, black tarry stools, rashes, itching, worsening of asthma, unexplained wheezing or shortness of breath, liver and kidney problems, headache, dizziness and hearing disturbance, and rarely skin peeling, easy bruising or facial swelling.