The purpose of this study is to evaluate the relative bioavailability for the new iberdomide powder for reconstitution formulation relative to the reference capsule formulation and to assess the effect of food on the pharmacokinetics of powder for reconstitution formulation in healthy adult participants.

Inclusion Criteria:

• Body mass index of 18.0 to 33.0 kilograms (kg)/square meter, inclusive, and body weight ≥50 kg.
• A female participant is eligible to participate if she is not of childbearing potential as defined in the protocol.
• Males who are sexually active with woman of childbearing potential must agree to follow instructions for method(s) of contraception as described in the protocol and included in the informed consent form.
• Male participants are required to use a condom and must refrain from donating sperm during the intervention period and for at least 28 days after the last dose of study intervention.

Exclusion Criteria:

• Any significant acute or chronic medical illness.
• Current or recent (within 3 months of the first dose of the investigational medicinal product) gastrointestinal disease or procedure that could possibly affect drug absorption, distribution, metabolism, and excretion (for example, bariatric procedure).
• Evidence of organ dysfunction or any clinically significant deviation from normal in physical examination, vital signs, electrocardiogram, or clinical laboratory determinations.
• Female who are of childbearing potential and females who are breastfeeding.

Note: Other protocol-defined inclusion/exclusion criteria apply.