An Investigational Study of Hydrocortisone

Inclusion Criteria: * Healthy male volunteers between 18 and 60 years of age, inclusive (at screening). * Subjects with a Body Mass Index (BMI) of 21-28. Body Mass Index = Body weight (kg) / (Height (m))\*2. * Subjects with no clinically significant abnormal serum biochemistry, haematology and urinalysis values within 14 days prior to Day 1 of Study Period 1. * Subjects with a negative urinary drugs of abuse screen, determined within 14 days prior to Day 1 of Study Period 1. A positive alcohol test may be repeated at the discretion of the Investigator. * Subjects with negative HIV and Hepatitis B and C results. * Subjects with no clinically significant abnormalities in 12-lead electrocardiogram (ECG) determined within 14 days prior to Day 1 of Study Period 1. * Subjects with no clinically-significant deviation outside the normal ranges for blood pressure and pulse measurements. * Subjects (unless anatomically sterile or where abstaining from sexual intercourse is in line with the preferred and usual lifestyle of the subject) and sexual partners must use effective contraception methods during the trial and for 3 months after the last dose, for example: * Oral contraceptive + condom * Intra-uterine device (IUD) + condom * Diaphragm with spermicide + condom * Subjects must be available to complete the study. * Subjects must satisfy a medical examiner about their fitness to participate in the study. * Subjects must provide written informed consent to participate in the study. Exclusion Criteria: * A clinically significant history of gastrointestinal disorder likely to influence drug absorption. * Receipt of regular medication within 14 days prior to Day 1 of Study Period 1 (including high dose vitamins, dietary supplements or herbal remedies). * Receipt of any vaccination within 14 days prior to Day 1 of Study Period 1. * Evidence of renal, hepatic, central nervous system, respiratory, cardiovascular or metabolic dysfunction. * Presence of clinically significant infections (systemic fungal and viral infections, acute bacterial infections). * Current or previous history of tuberculosis. * A clinically significant history of previous allergy / sensitivity to Hydrocortisone and/or Dexamethasone. * A clinically significant history or family history of psychiatric disorders/illnesses. * A clinically significant history of drug or alcohol abuse. * Inability to communicate well with the Investigator (i.e., language problem, poor mental development or impaired cerebral function). * Participation in a New Chemical Entity clinical study within the previous 4 months or a marketed drug clinical study within the previous 3 months. (N.B. The washout period between trials is defined as the period of time elapsed between the last dose of the previous study and the first dose of the next study) * Subjects who have consumed more than 2 units of alcohol per day within seven (7) days prior to Day 1 of Study Period 1or have consumed any alcohol within the 48 hour period prior to Day 1 of Study Period 1. * Donation of 450ml or more of blood within the previous 3 months. * Subjects who smoke (or ex-smokers who have smoked within 6 months prior to Day 1 of Study Period 1). * Subjects who work shifts (i.e. regularly alternate between days, afternoons and nights).