Which form of medication is made primarily of liquids that can be administered via inhalation?

The form of medication that is made primarily of liquids and can be administered via inhalation is aerosol spray. This type of formulation is specifically designed to convert liquid medication into tiny droplets or particles that can be easily inhaled into the lungs. Aerosol sprays take advantage of propellant mechanisms to create a fine mist, delivering medication directly to the respiratory system, which is particularly beneficial for conditions such as asthma or chronic obstructive pulmonary disease (COPD).

In contrast, the other options consist of solid or semi-solid forms of medication that are not suitable for inhalation. Tablets and capsules are solid dosage forms that must dissolve in the gastrointestinal tract, while suppositories are designed for insertion into the rectum or vagina, bypassing the respiratory system altogether. Thus, aerosol sprays uniquely fulfill the requirement for liquid medication that can be effectively administered through inhalation.