Study to Evaluate the Response to Treatment and Safety of 0.03% Tacrolimus (FK506) Ointment Administered in Pediatric Patients With Moderate to Severe Atopic Dermatitis

Inclusion Criteria: * Patient may be male or female of any ethnic group * Patient is aged 2 years to 15 years (not having completed his/her 16th birthday) and suffers from moderate to severe atopic dermatitis (Rajka/Langeland score of at least 4.5). * Patient known to be responsive to topical steroids * Patient's legal representative has given written informed consent. If the patient is capable of understanding the purposes and risks of the trial written informed consent has been obtained from the patient as well. Female patients of childbearing potential must agree to maintain adequate birth control practice during the trial period and during the first four weeks after the end of the study * Patient meets the following wash-out criteria: * Topical corticosteroids * Systemic corticosteroids (for the treatment of AD only) * Systemic non-steroidal immunosuppressants (e.g. cyclosporine, methotrexate) * Other investigational drugs * Light Treatments (UVA, UVB) * Patient has not taken/patient and legal representative agree that the patient does not take for the complete study period any medication or therapy prohibited by the protocol Exclusion Criteria: * Patient has a genetic epidermal barrier defect such as Netherton's syndrome or generalised erythroderma * Patient is pregnant or breast-feeding * Patient has a skin infection on the affected (and to be treated) area * Patient has a known hypersensitivity to macrolides in general, to Tacrolimus or any excipient of the ointment * Patient is simultaneously participating in any other drug trial or less than 28 days have passed between the end of the previous trial and this one * Any form of substance abuse (including drug or alcohol abuse), psychiatric disorder or condition which, in the opinion of the investigator, may invalidate the communication with the investigator * Patient is known to be HIV positive