Metered-Dose Inhalation Therapy
Basic Information 
Overview and Goal(s)
• The purpose of inhaled therapy is to deliver an amount of medication that ensures therapeutic concentrations in the lower respiratory tract. Inhalation therapy is an alternative to parenteral dosing, allowing treatment with small doses of drug to minimize toxicity and side effects.
• Different types of inhalation devices are available including:
Indications
• Inhalation therapy is recommended for treatment of many respiratory disorders that occur with bronchoconstriction, inflammation, and/or infection of the lower respiratory tract.
• The most common conditions in which inhaled therapy is used in horses include:
• The most common medications and doses used in inhalation therapy are listed in Table 1.
Equipment, Anesthesia
• Inhalation therapy has been achieved with diverse devices such as nebulizers (jet and ultrasonic), MDIs, and DPIs.
The most commonly used are MDIs, which do not require expensive and fragile equipment (ultrasonic nebulizer), or other devices that can produce loud noise (jet nebulizer).
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