**Question:** All of the following glucocorticoids can be given by inhalation EXCEPT

A. Prednisolone
B. Dexamethasone
C. Hydrocortisone
D. Methylprednisolone

**Correct Answer: C. Hydrocortisone**

**Core Concept:** Glucocorticoids are a class of corticosteroid hormones that have anti-inflammatory, immunosuppressive, and anti-proliferative effects. They are commonly used to treat a variety of respiratory, dermatological, and rheumatological conditions. Glucocorticoids can be administered via various routes, including inhalation, oral, and intravenous.

**Why the Correct Answer is Right:** Hydrocortisone is a glucocorticoid, but it is not typically administered via inhalation. Hydrocortisone is generally formulated for systemic administration, either orally, intravenously, or topically. Inhalation of glucocorticoids allows for direct targeting of the airways and minimizes systemic side effects.

**Why Each Wrong Option is Incorrect:**

**A. Prednisolone:** Prednisolone is another glucocorticoid used for the treatment of respiratory and dermatological conditions. It is available in inhalation formulations, making it incorrect as an option.

**B. Dexamethasone:** Dexamethasone is another glucocorticoid used in the management of various inflammatory disorders. It is available in inhalation formulations, making it incorrect as an option.

**D. Methylprednisolone:** Methylprednisolone is used for the treatment of various inflammatory disorders, including respiratory diseases. It is available in inhalation formulations, making it incorrect as an option.

**Clinical Pearl:** Inhalation corticosteroids are advantageous over oral corticosteroids in treating asthma and other respiratory conditions, as they directly target the airways, minimizing systemic side effects and improving therapeutic efficacy. This allows for more precise control of inflammation and reduces the risk of systemic complications associated with oral corticosteroids, like weight gain, osteoporosis, and increased susceptibility to infections.

**Why Hydrocortisone is Incorrect:** Hydrocortisone is not typically administered via inhalation due to its broad systemic action and potential side effects. Instead, inhalation of corticosteroids like prednisolone, dexamethasone, and methylprednisolone is preferred for the treatment of respiratory conditions as they are designed for local action on the airways, reducing the risk of systemic side effects and enhancing therapeutic efficacy.