Pharmacokinetics and safety profiles of topical agents in pregnancy: A walkthrough

Section role: This presentation supports the 'Pharmacokinetics and Safety Profiles of Topical Agents' section, guiding students through the mechanisms of topical absorption, ingredient safety classifications, and specific examples, while the teacher lectures. Slide outline: (1) Title Slide: 'Pharmacokinetics and Safety of Topical Skincare in Pregnancy'. (2) Physiological Changes & Absorption: Review of skin changes in pregnancy (e.g., increased vascularity) and how percutaneous absorption impacts maternal-fetal transfer, including the concept of the maternal-fetal interface. (3) The Retinoid Cautionary Tale: Explanation of Vitamin A derivatives (e.g., Tretinoin, Adapalene) and their link to embryopathy, emphasizing the teratogenic risk. (4) Key Ingredients to AVOID: Detailed list of 'The Big Three'—Retinoids, Hydroquinone (high absorption), and high-dose Salicylic Acid—with their specific risks. (5) Safe Alternatives for Common Concerns: Presentation of safe options such as Azelaic acid for acne, Vitamin C for antioxidant support, and mineral sunscreens (Zinc Oxide, Titanium Dioxide) compared to chemical filters like Oxybenzone. (6) The 'Natural Fallacy': Discussion on why some 'natural' ingredients, like essential oils (e.g., rosemary, jasmine), can still be contraindicated in pregnancy despite their perceived safety. (7) Conditional Use: Benzoyl Peroxide & Glycolic Acid: Explanation of when and at what limited concentrations Benzoyl Peroxide and Glycolic Acid may be considered safe, highlighting concentration importance. (8) Systemic Fetal Exposure Factors: An illustrative example or prompt asking about factors influencing systemic fetal exposure from topical steroids (e.g., surface area, skin integrity, product concentration). (9) Summary of Green, Yellow, Red List: A consolidated visual guide categorizing ingredients into safe, caution, and avoid. (10) Case Application Preview: Brief mention that understanding these profiles is critical for ingredient list audits and patient scenarios, setting up the next lesson section. Closing slide: 'What key principle should guide all topical prescriptions for pregnant patients?'

Lara from Teachy