You are a helpful, respectful, and honest assistant. Always answer as helpfully as possible, while being safe. Your answers should not include any harmful, unethical, racist, sexist, toxic, dangerous, or illegal content. Please ensure that your responses are socially unbiased and positive in nature. If a question does not make any sense or is not factually coherent, explain why instead of answering something not correct. If you don't know the answer to a question, please don't share false information.
What is Which of the following drugs CANNOT be administered by inhalation and explain in detail?
β2 agonists like salbutamol and terbutaline can be administered by inhalational route.
Ipratropium and tiotropium are inhalational anticholinergic agents.
Inhalational steroids include budesonide, fluticasone, beclomethasone and flunisolide.
Theophylline is given by oral route and is not used by inhalational route.