Pruritus, or itching, is a common symptom that can significantly impact a patient’s quality of life. Itch sensation is primarily mediated by a subset of small-diameter primary sensory neurons called itch-specific neurons, which express specific receptors such as histamine H1 and protease-activated receptors on their nerve endings. Upon stimulation by pruritogens, such as histamine, proteases, cytokines, and neuropeptides, these neurons release neurotransmitters, including substance P and calcitonin gene-related peptide, that activate downstream neurons in the spinal cord and brain, leading to the sensation of itch.

There are various agents used in dermatology for the treatment of pruritus, including topical and systemic options. These agents may act through different mechanisms, such as reducing inflammation, blocking histamine receptors, or targeting specific neurotransmitters involved in pruritus. Dermatologists may use a combination of therapies to manage pruritus, including topical corticosteroids, antihistamines, calcineurin inhibitors, and systemic agents such as gabapentin and pregabalin.

In this learning module, you will find a comprehensive review of the different agents used for the treatment of pruritus, their mechanisms of action, indications, contraindications, adverse effects, and drug interactions.

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