FDA Orange Book
Is there a generic for Siklos?
Siklos contains hydroxyurea. Orange Book status for every listed strength, the approved generic makers, and the listed patents and exclusivities.
Source: FDA Orange Book data file dated 2026-10-09. Publisher page
No. The Orange Book lists no active FDA-approved generic (ANDA) for Siklos (hydroxyurea).
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Siklos products in the Orange Book
| Form and route | Strength | Brand status | Brand TE | Active generics | Generic TE codes |
|---|---|---|---|---|---|
| tablet, oral | 100MG | Marketed (Rx) | None | 0 | None |
| tablet, oral | 1GM | Marketed (Rx) | None | 0 | None |
NDA 208843, held by THERAVIA PHARMA. Active generics are ANDA products in the Orange Book prescription list with the same ingredient, dosage form, route and strength.
Siklos NDC codes
Questions
Is there a generic for Siklos?
No. The Orange Book lists no active FDA-approved generic (ANDA) for Siklos (hydroxyurea).
What is the generic name for Siklos?
The active ingredient in Siklos is hydroxyurea, per the FDA Orange Book.
What does a therapeutic equivalence code mean?
In the Orange Book, codes that start with A (such as AB) mean FDA considers the product therapeutically equivalent to the reference drug. Codes that start with B mean FDA does not, at this time, consider the product therapeutically equivalent.