Does erythromycin ethylsuccinate expire?
The printed date covers the sealed pack. Once erythromycin ethylsuccinate is opened, mixed or diluted, its label sets a second and usually much shorter limit — quoted below, per product.
Shortest limit on any erythromycin ethylsuccinate label: 10 days
“After mixing, store in the refrigerator and use within 10 days.”
That applies to the product it is printed on, not to every form of erythromycin ethylsuccinate — check which one you have against the list below.
What the labels say
“After mixing, store in the refrigerator and use within 10 days.”
On the label for E.E.S 400 · DailyMed
“After mixing, refrigerate and use within 10 days.”
On the label for E.E.S 400 · DailyMed
“After reconstitution, Ery-Ped 200 and Ery-Ped 400 must be stored at or below 77°F (25°C) and used within 35 days; refrigeration is not required.”
On the label for Ery-Ped · DailyMed
“L and erythromycin ethylsuccinate for oral suspension, USP 400 mg/5 mL must be stored at 20° to 25° C (68° to 77° F) [see USP Controlled Room Temperature] and use within 35 days; refrigeration is not required.”
On the label for Erythromycin ethylsuccinate · DailyMed
“After reconstitution, Erythromycin Ethylsuccinate for Oral Suspension USP, 200 mg/5 mL and 400 mg/5 mL must be stored at or below 77°F (25°C) and used within 35 days; refrigeration is not required.”
On the label for Erythromycin Ethylsuccinate · DailyMed
“After reconstitution, Erythromycin Ethylsuccinate 200 and Erythromycin Ethylsuccinate 400 must be stored at or below 77°F (25°C) and used within 35 days; refrigeration is not required.”
On the label for ERYTHROMYCIN ETHYLSUCCINATE · DailyMed
How the label says to keep erythromycin ethylsuccinate
Storage is the other half of the question: the stability behind any date assumes these conditions, and a medicine kept outside them ages faster than the calendar says.
- “Store Ery-Ped 200 and Ery-Ped 400, prior to mixing, below 86°F (30°C).”
- “Store erythromycin ethylsuccinate for oral suspension, USP 200 mg/5 mL and erythromycin ethylsuccinate for oral suspension, USP 400 mg/5 mL, prior to mixing, below 86°F (30°C).”
- “SP, 400 mg are supplied as mottled pink, oval tablets bearing the Code 74 ZE in: Bottles of 30 ( N D C 24338 -110-03) Recommended storage Protect tablets from exposure to light and moisture.”
- “Store below 86°F (30°C).”
- “Recommended storage Protect tablets from exposure to light and moisture.”
- “Store Erythromycin Ethylsuccinate for Oral Suspension USP, 200 mg/5 mL and 400 mg/5 mL, prior to mixing, below 86°F (30°C).”
- “Store granules, prior to mixing, at 20° to 25°C (68° to 77°F) [see USP Controlled Room Temperature].”
- “Store granules, before mixing, below 86°F (30°C).”
Frequently asked questions
Does erythromycin ethylsuccinate expire?
Two different clocks apply and only one of them is the printed date. The date on a sealed pack is the manufacturer's guarantee for the unopened product. Once it is opened, mixed or diluted, the label imposes its own limit — as tight as 10 days on some erythromycin ethylsuccinate products, and that is the number quoted on this page.
Can I still use erythromycin ethylsuccinate after the date on the box?
This page cannot tell you that, and nor can any page. The FDA's own shelf-life programme found 88% of tested lots stayed within specification at least a year past expiry — and concluded in the same breath that lot-to-lot variation means this can only be confirmed by testing each lot. What you can check at home is the in-use limit above and whether the product has been stored as the label requires. Ask a pharmacist about a specific pack; they will also dispose of what you no longer need.
Why do different erythromycin ethylsuccinate products have different limits?
Because they are different formulations. A suspension that gets mixed with water, a pen that gets carried at room temperature, and a sealed tablet do not behave alike, so each manufacturer's label sets its own limit and each is shown here with the product it belongs to. We never merge them into one number for the molecule.
More on erythromycin ethylsuccinate
Quoted from FDA labels for reference, not medical advice, and not a suggestion to use anything past its limit. If you are unsure whether a pack is still good, a pharmacist can tell you and can dispose of it safely.