Homocystinuria: Treatment With N-Acetylcysteine

Inclusion Criteria: * Homocystinuria (lens dislocation and hyperhomocysteinemia) * Age ≥ 18 (the age of majority in Canada) Exclusion Criteria: * Nursing mothers or pregnant women * Chronic liver disease * Taking nitrates * Cystine stone formers * History of active peptic ulcer disease * Subjects receiving carbamazepine and metoclopramide * Use of other products containing cysteine or N-acetylcysteine (e.g. nebulized NAC, cysteine supplements, methionine restriction) * Hypersensitivity to any ingredient in the study product * Clinically significant, abnormal laboratory test on screening (Visit 2) Other Criteria: * Women of child-bearing capacity must be using an acceptable method of birth control and have a negative pregnancy test before being enrolled