The primary objective of this study is to compare the pharmacokinetic and pharmacodynamic effect of two commercial preparations of interferon beta-1a (IFN Test: Lab Bergamo and IFN Comparator: Rebif ® - Merck Serono Lab) after single administration (12.000UI) in healthy subjects by modifying the parameters Cmax, Tmax and AUC (pharmacokinetics) and the levels of 2'5' oligoadenylate synthase and beta-2-microglobulin (pharmacodynamics).

Secondly, safety will be observed (tolerability) clinically after administration of a single dose in study subjects, by comparing the clinical and laboratory parameters before and after study and the incidence of adverse events.

Inclusion Criteria:

1. Accepted Informed Consent
2. Study subjects male, aged 18 to 50 years;
3. Research subjects with body mass index greater than or equal to 19 and less than or equal to 30;
4. Subjects considered healthy, based on the analysis of the clinical history and clinical and laboratory data.

Exclusion Criteria:

1. Having donated or lost 450 mL or more of blood in the 6 months preceding the study;
2. Have participated in any experimental study or have ingested any drug trial in the 12 months preceding the start of the study;
3. Having made regular use of medication in the 4 weeks prior to the start of the study or have made use of medications that interfere with the pharmacokinetics / pharmacodynamics of drugs studied a week before the start of the study;
4. Have been hospitalized for any reason, up to 8 weeks before the start of the study;
5. Demonstrate a history of alcohol abuse, drugs, or drugs, or have consumed alcohol within 48 hours prior to the period of hospitalization;
6. Have a history of liver disease, renal, pulmonary, gastrointestinal, hematological or psychiatric;
7. To present the pressure of any etiology requiring pharmacological treatment;
8. Display history of myocardial infarction, angina and / or heart failure.