Male hypogonadism, a disorder associated with testosterone deficiency, is frequently seen in clinical practice and has significant effects on patient wellbeing. The purpose of this study is to investigate the efficacy and safety of ARD-0403 as a testosterone replacement therapy in testosterone deficient men.

Inclusion Criteria:

• Testosterone deficiency

Exclusion Criteria:

• Previous treatment with testosterone replacement therapy within 4 weeks
• Moderate-severe benign prostatic hypertrophy, or prostatic cancer
• Haematocrit >50%