FDA Approves Topical PDE4-Inhibitor Roflumilast for PsoriasisA topical formulation of a PDE4 inhibitor approved for treating COPD has been approved for treatment of plaque psoriasis. FDA Approvalsadminjulio 30, 2022Uncategorized A topical formulation of a PDE4 inhibitor approved for treating COPD has been approved for treatment of plaque psoriasis. FDA Approvals