Drug interactions
Lisdexamfetamine + Sodium acid
Severity: Moderate
Lisdexamfetamine and Sodium acid: 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
Sodium acid phosphate acidifies the urine, which increases renal excretion of amphetamine, the active metabolite of lisdexamfetamine. This can lower amphetamine levels and reduce the therapeutic effect.
What this interaction means in plain words
Lisdexamfetamine and Sodium acid 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.
Why it happens
Urinary acidification increases ionization of amphetamine and reduces tubular reabsorption, enhancing renal clearance.
What to do
Assess clinical response and consider an alternative to urinary acidifiers if effect is reduced. Dose adjustment of lisdexamfetamine may be needed when acidifying agents are started or stopped.
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 Lisdexamfetamine
- Isocarboxazid + Lisdexamfetamine Contraindicated
- Linezolid + Lisdexamfetamine Contraindicated
- Lisdexamfetamine + Phenelzine Contraindicated
- Lisdexamfetamine + Procarbazine Contraindicated
- Lisdexamfetamine + Rasagiline Contraindicated
- Lisdexamfetamine + Safinamide Contraindicated
Frequently asked questions
Can I take Lisdexamfetamine with Sodium acid?
MediHelp rates the interaction as moderate. Lisdexamfetamine and Sodium acid 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. Sodium acid phosphate acidifies the urine, which increases renal excretion of amphetamine, the active metabolite of lisdexamfetamine. This can lower amphetamine levels and reduce the therapeutic effect.
How serious is the interaction between Lisdexamfetamine and Sodium acid?
MediHelp rates it moderate, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Assess clinical response and consider an alternative to urinary acidifiers if effect is reduced. Dose adjustment of lisdexamfetamine may be needed when acidifying agents are started or stopped.
What other medicines interact with Lisdexamfetamine?
MediHelp also lists interactions of Lisdexamfetamine with, for example, Isocarboxazid, Linezolid, Phenelzine. The full list is on the Lisdexamfetamine page.
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