<p>Embryo-fetal toxicity, hematologic toxicity, venous and arterial thromboembolism, increased mortality in patients with CLL, second primary malignancies, hepatotoxicity, severe cutaneous reaction tumor lysis syndrome, tumor flare reactions, impaired stem cell mobilization, thyroid disorders. early mortality in patients with MCL, hypersensitivity. Severe Hypersensitivity Reactions: Lenalidomide is contraindicated in patients who have demonstrated hypersensitivity (e.g., angioedema, Stevens-Johnson syndrome, toxic epidermal necrolysis) to Lenalidomide.</p>