Which method of administration involves spraying or inhaling medication into the respiratory system?

Inhalation administration involves delivering medication directly into the respiratory system through the act of spraying or inhaling. This method is particularly effective for medications intended to treat respiratory conditions, as it allows for rapid absorption of the drug into the bloodstream via the large surface area of the lungs. By delivering medication in this way, it can also help to minimize systemic side effects compared to other routes of administration.

Inhalation administration can come in various forms, such as nebulizers, metered-dose inhalers, or dry powder inhalers, each designed to optimize the delivery of medication to the airways. This method is often preferred for conditions like asthma or chronic obstructive pulmonary disease (COPD), where quick relief of symptoms is needed.

In contrast, injection administration involves delivering medication directly into the body through various types of injections, which is not the same as delivering a drug through the respiratory pathway. Vaginal and rectal administrations, on the other hand, involve different parts of the body and would not deliver medication into the respiratory system.