This study will investigate the bioequivalence and compare the safety profiles following inhalation of Vantobra to TOBI nebulizer solution in healthy subjects.

Bioequivalence will be investigated based on the pharmacokinetic plasma profiles of Vantobra nebulizer solution compared to TOBI nebulizer solution.

Inclusion Criteria:

• Male or female healthy subjects of any ethnic origin
• Aged between 18 and 50 years of age
• Body weight of ≥50 kg and body mass index (BMI) between 18.5 and 29 kg/m2
• FEV1 > 90% of predicted
• Able to demonstrate correct inhaler use
• Written informed consent

Exclusion Criteria:

• History of clinically relevant allergies or idiosyncrasies to tobramycin or any other inactive ingredient(s) of the IMP
• Any history of drug hypersensitivity, asthma, urticaria, or other significant allergic diathesis.
• Any evidence of cardiovascular, pulmonary, renal, hepatic, gastrointestinal, hematological, endocrinological, metabolic, neurological, psychiatric or other diseases at screening
• Surgery of the gastrointestinal or respiratory tract which might interfere with drug absorption
• History of malignancy within the past 5 years
• History of orthostatic hypotension, faintings or blackouts
• Acute or chronic viral, bacterial or fungal airway infections, including laryngeal infections, mouth and throat infections, and hoarseness;
• Other clinically relevant chronic or acute infectious illnesses
• Clinical chemical, hematological or any other laboratory parameters clinically relevant outside the normal range