Drug interactions
Hydroxyurea + Thioguanine
Severity: Moderate
Hydroxyurea and Thioguanine: moderate interaction.
Last updated
For healthcare professionals — reference only. This page is a brief summary, not medical advice and not a substitute for official labeling or clinical judgement. Always verify before prescribing or dispensing.
Summary
Both drugs depress bone marrow function, so together they can worsen cytopenias. This increases the risk of infection, anemia and bleeding.
What this interaction means in plain words
Hydroxyurea and Thioguanine can affect each other. The combination is often manageable, but it may need a change of dose, a change of timing, or extra checks while both are taken.
Hydroxyurea belongs to Miscellaneous; Thioguanine belongs to Oncology.
Why it happens
Additive myelosuppression through different antimetabolite mechanisms.
What to do
Check complete blood counts frequently and reduce or interrupt doses when counts fall. Provide supportive care as needed.
What to ask your pharmacist
- Should I take them at different times of day?
- Does the dose of either medicine need to change?
- Is there anything I should avoid, such as alcohol or certain foods, while on both?
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Other interactions of Thioguanine
Other interactions of Hydroxyurea
Frequently asked questions
Can I take Hydroxyurea with Thioguanine?
MediHelp rates the interaction as moderate. Hydroxyurea and Thioguanine can affect each other. The combination is often manageable, but it may need a change of dose, a change of timing, or extra checks while both are taken. Both drugs depress bone marrow function, so together they can worsen cytopenias. This increases the risk of infection, anemia and bleeding.
How serious is the interaction between Hydroxyurea and Thioguanine?
MediHelp rates it moderate, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Check complete blood counts frequently and reduce or interrupt doses when counts fall. Provide supportive care as needed.
What other medicines interact with Thioguanine?
MediHelp also lists interactions of Thioguanine with, for example, Adenovirus types 4 and 7 live, Axicabtagene ciloleucel, Belatacept. The full list is on the Thioguanine page.
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