Photosensitivity's the amount to which an object reacts upon receiving photons, especially visible light. Interpretation in medicine Sensitivity of the skin to a light source can take various forms. People with particular skin types are more sensitive to sunburn. Particular medications make the skin more sensitive to sunlight; these include most of the tetracycline antibiotics, heart drugs amiodarone, and sulfonamides. Particular conditions lead to increased light sensitivity. Patients with sys… (More on Photosensitivity)