Update on Ascor Availability

Updated: 10/21/2025

McGuff Pharmaceutical, Inc. is committed to returning Ascor® (Ascorbic Acid Injection, USP) to the U.S. market as soon as possible. We are actively coordinating with the U.S. Food and Drug Administration (FDA) and our supply partners to complete the remaining steps necessary for product release. At this time, product release timing has not been finalized. Several factors continue to influence availability, including supply chain conditions and FDA lot-release processes. Because some of these factors are external to McGuff, timelines may change without prior notice. Please be assured that restoring Ascor® supply remains our highest priority. All McGuff employees are working diligently to ensure that when Ascor® returns to the market, it meets the quality, safety, and reliability standards expected by both customers and regulators. We understand the importance of this medication to patients and healthcare providers, and we appreciate your continued patience and understanding. We will provide additional updates as soon as more definitive information becomes available.

For questions regarding current or pending orders, please contact:
McGuff Company, Inc. Customer Service: 1 800 854-7220

Manufacturer: McGuff Pharmaceuticals

Manufacturer: McGuff Pharmaceuticals (Shop the Brand)

ASCOR® FDA-Approved Ascorbic Acid Injection (Vitamin C), USP, 500mg/mL, 50mL

Item Code: GuestAscor

Mfg Part #: 67157-101-51

No detectable levels of allergens (amino acids, proteins, and polypeptides) including corn allergens.

No genetically modified organisms.

Please choose one:

Institutional Hospital, pharmacy, acute care, urgent care, home health care, etc.

Private Practice Physician Complementary and Alternative Medicine physicians and clinics that are CAM physician owned and operated by the physician owner and administer the product in their practice. These practices are independent and not associated with any larger entity such as hospitals, clinics, urgent care facilities, etc.

First Name

Last Name

Physician Type

State

License #

Institution Type

Institution Name

McGuff Company practices responsible pharmaceutical pricing.

Watch to Learn More About the Benefits of ASCOR®

About This Product

Ascor® is vitamin C indicated for the short term (up to 1 week) treatment of scurvy in adult and pediatric patients age 5 months and older for whom oral administration is not possible, insufficient or contraindicated.

ASCOR is not indicated for treatment of vitamin C deficiency that is not associated with signs and symptoms of scurvy.

Important Safety Information

Ascorbic acid has been associated with development of acute or chronic oxalate nephropathy following prolonged use of high doses of ascorbic acid infusion. Patients with renal disease including renal impairment, history of oxalate kidney stones, geriatric patients, and pediatric patients less than 2 years old may be at increased risk.
Patients with glucose-6-phosphate dehydrogenase deficiency are at risk of severe hemolysis; a reduced dose is recommended.
Ascorbic acid may interfere with laboratory tests based on oxidation-reduction reactions, including blood and urine glucose testing.
Ascorbic acid may decrease the activities of erythromycin, kanamycin, streptomycin, doxycycline, and lincomycin. Bleomycin is inactivated in vitro by ascorbic acid.
Ascorbic acid may cause acidification of the urine and result in decreased amphetamine serum levels and affect excretion and plasma concentrations of other drugs sensitive to urine pH.

Supplied in Pharmacy Bulk Package (PBP)

To report SUSPECTED ADVERSE REACTIONS, contact McGuff Pharmaceuticals, Inc., toll free at 1-800-603-4795 or FDA at 1-800-FDA-1088 or www.fda.gov/medwatch.

Ascor Package Insert

View OnlineView PDF (297kb)

Looking for one of the following?

International

No Prescription Required
Approved for sale outside of the United States

More Info

Clinical Trial

McGuff is uniquely positioned to assist clinical trial investigators, directors and sponsors to perform Investigational New Drug (IND) clinical trial phases 1, 2, and 3.

More Info

Supplied in a Pharmacy Bulk Package (PBP). Dispense single doses to multiple patients in a pharmacy admixture program; use within 4 hours of puncture.
Must be diluted prior to use.
Administer as a slow intravenous infusion.
See Full Prescribing Information for important administration instructions.
Maximum recommended duration is one week.

Population	Recommended Doses
Pediatric Patients age 5 months to less than 12 months	50 mg once daily
Pediatric Patients age 1 year to less than 11 years	100 mg once daily
Adults and Pediatric Patients age 11 years and older	200 mg once daily
Specific Populations
Pregnant women, lactating women, patients with glucose-6-phosphate dehydrogenase deficiency	Should not exceed the U.S. Recommended Dietary Allowance (RDA)

DOSAGE AND ADMINISTRATION

Important Preparation and Administration Instructions

ASCOR^® vials contain 25,000 mg of ascorbic acid and the largest recommended single dose is 200 mg. Do not give the entire contents of the vial to a single patient.
Do not administer ASCOR^® as an undiluted intravenous injection.
Minimize exposure to light because ASCOR^® is light sensitive.
ASCOR^® is supplied as a Pharmacy Bulk Package (PBP) which is intended for dispensing of single doses to multiple patients in a pharmacy admixture program and is restricted to the preparation of admixtures for infusion:
- Use only in a suitable ISO Class 5 work area such as a laminar flow hood (or an equivalent clean air compounding area).
- Penetrate each PBP vial closure only one time with a suitable sterile transfer device or dispensing set that allows measured dispensing of the contents. Given that pressure may develop within the vial during storage, exercise caution when withdrawing contents from the vial.
- Once the closure system has been penetrated, complete all dispensing from the PBP vial within 4 hours. Each dose must be used immediately. Discard unused portion.
- Prior to administration, ASCOR^® must be diluted in a suitable infusion solution and the final solution for infusion must be isotonic (undiluted the osmolarity of ASCOR^® is approximately 5,900 mOsmol/L). Prior to preparing the admixture for infusion, calculate the osmolarity of the intended admixture for infusion. Add one daily dose of ASCOR^® directly to an appropriate volume of a suitable infusion solution (e.g. 5% Dextrose Injection, Sterile Water for Injection) and add appropriate solutes, as necessary, to make the final solution isotonic. Sterile Water for Injection is highly hypotonic; adjust solute content, as necessary, to make the final infusion solution isotonic prior to injection. Do not mix ASCOR^® with solutions containing elemental compounds that can be reduced (e.g., copper). The concentration of ascorbic acid in the final, admixture solution for infusion is to be in the range of 1 to 25 mg of ascorbic acid per mL. For example, for the largest recommended dose: Add 200 mg of ascorbic acid (equivalent to 0.4 mL of ASCOR^®) to 7.5 mL of Sterile Water for Injection to produce an infusion solution having an approximate osmolarity of 290 mOsmol/L. In this specific example, addition of solute is NOT necessary because the solution is isotonic.
- Prepare the recommended dose based on the patient population.
- Visually inspect for particulate matter and discoloration prior to administration (the diluted ASCOR^® solution should appear colorless to pale yellow).
- Immediately administer the admixture for infusion as a slow intravenous infusion.

Recommended Dosage

Table 1 provides recommended doses of ASCOR^® based on patient population and infusion rates of diluted ASCOR^® solution.

Table 1: Recommended Dose of ASCOR^® and Infusion Rate of Diluted ASCOR^® Solution

Patient Population	ASCOR^® Once Daily Dose (mg)	Infusion Rate of Diluted ASCOR^® Solution (mg/minute)
Pediatric Patients age 5 months to less than 12 months	50	1.3
Pediatric Patients age 1 year to less than 11 years	100	3.3
Adults and Pediatric Patients age 11 years and older	200	33

The recommended maximum duration of daily treatment with ASCOR^® is seven days. If no improvement in scorbutic symptoms is observed after one week of treatment, retreat until resolution of scorbutic symptoms is observed.

Repeat dosing is not recommended in pediatric patients less than 11 years of age.

Dose Reduction in Specific Populations

Women who are pregnant or lactating and patients with glucose-6-dehydrogenase deficiency should not exceed the U.S. Recommended Dietary Allowance (RDA) or daily Adequate Intake (AI) level for ascorbic acid for their age group and condition.

Contraindications

None

WARNINGS AND PRECAUTIONS

Oxalate Nephropathy and Nephrolithiasis

Acute and chronic oxalate nephropathy have been reported with prolonged administration of high doses of ascorbic acid. Acidification of the urine by ascorbic acid may cause precipitation of cysteine, urate or oxalate stones. Patients with renal disease including renal impairment, history of oxalate kidney stones, and geriatric patients may be at increased risk for oxalate nephropathy while receiving treatment with ascorbic acid. Pediatric patients less than 2 years of age may be at increased risk for oxalate nephropathy during treatment with ascorbic acid because their kidneys are immature. Monitor renal functions in these patients during treatment with ASCOR^®. Discontinue ASCOR^® in patients who develop oxalate nephropathy and treat any suspected oxalate nephropathy.

ASCOR^® is not indicated for prolonged administration (the maximum recommended duration is one week).

Hemolysis in Patients with Glucose-6-Phosphate Dehydrogenase Deficiency

Hemolysis has been reported with administration of ascorbic acid in patients with glucose-6-phosphate dehydrogenase deficiency. Patients with glucose-6-phosphate dehydrogenase deficiency may be at increased risk for severe hemolysis during treatment with ascorbic acid. Monitor hemoglobin and blood count and use a reduced dose of ASCOR^® in patients with glucose-6-phosphate dehydrogenase deficiency. Discontinue treatment with ASCOR^® if hemolysis is suspected and treat as needed.

Laboratory Test Interference

Ascorbic acid may interfere with laboratory tests based on oxidation-reduction reactions, including blood and urine glucose testing, nitrite and bilirubin levels, and leucocyte count testing. If possible, laboratory tests based on oxidation-reduction reactions should be delayed until 24 hours after infusion of ASCOR^®.

ADVERSE REACTIONS

The following adverse reactions are discussed in greater detail in other sections of the labeling:

Oxalate nephropathy and Nephrolithiasis [see Warnings and Precautions]
Hemolysis in patients with glucose-6-phosphate dehydrogenase deficiency [see Warnings and Precautions]

The above adverse reactions associated with the use of ascorbic acid were identified in the literature. Because these reactions are reported voluntarily from a population of uncertain size, it is not always possible to estimate their frequency reliably or to establish a causal relationship to drug exposure.

Administration site reactions: pain and swelling.

ASCOR^® should not be rapidly administered. Rapid intravenous administration (>250 mg/minute) of ASCOR^® may cause temporary faintness or nausea, lethargy, flushing, dizziness, and headache (the recommended infusion rates of diluted ASCOR^® solution are 1.3 mg/minute (Pediatric Patients age 5 months to less than 12 months), 3.3 mg/minute (Pediatric Patients age 1 year to less than 11 years) and 33 mg/minute (Adults and Pediatric Patients 11 years and older)).

Acute and chronic oxalate nephropathy have occurred with prolonged administration of high doses of ascorbic acid. In patients with glucose-6-phosphate dehydrogenase deficiency severe hemolysis has occurred.

DRUG INTERACTIONS

Antibiotics

Ascorbic acid may decrease activities of erythromycin, kanamycin, streptomycin, doxycycline, and lincomycin. Bleomycin is inactivated in vitro by ascorbic acid. If the antibiotic efficacy is suspected to be decreased by concomitant administration of ASCOR^®, discontinue ASCOR^® administration.

Amphetamine & Other Drugs Affected by Urine Acidification

Ascorbic acid may acidify the urine and lower serum concentrations of amphetamine by increasing renal excretion (as reflected by changes in amphetamine urine recovery rates). In case of decreased amphetamine efficacy discontinue ASCOR^® administration. Standard monitoring of therapy is warranted.

In addition, acidification of urine by ascorbic acid will alter the excretion of certain drugs affected by the pH of the urine (e.g. fluphenazine) when administered concurrently. It has been reported that concurrent administration of ascorbic acid and fluphenazine has resulted in decreased fluphenazine plasma concentrations. Standard monitoring of therapy is warranted.

Warfarin

Limited case reports have suggested interference of ascorbic acid with the anticoagulation effects of warfarin, however, patients on warfarin therapy treated with ascorbic acid doses up to 1000 mg/day (5 times the largest recommended single dose) for 2 weeks (twice the maximum recommended duration), no effect was observed. Standard monitoring for anti-coagulation therapy should continue during ascorbic acid treatment, as per standard of care.

Laboratory Test Interference

Because ascorbic acid is a strong reducing agent, it can interfere with numerous laboratory tests based on oxidation-reduction reactions (e.g. glucose, nitrite and bilirubin levels, leukocyte count, etc.). Chemical detecting methods based on colorimetric reactions are generally those tests affected. Ascorbic acid may lead to inaccurate results (false negatives) obtained for checking blood or urinary glucose levels, nitrite, bilirubin, and leukocytes if tested during or within 24 hours after infusion.

USE IN SPECIFIC POPULATIONS

Pregnancy

Risk Summary

There are no available data on the use of ASCOR^® in pregnant women to inform a drug-associated risk of adverse developmental outcomes; however, ascorbic acid (vitamin C) has been used during pregnancy for several decades and no adverse developmental outcomes are reported in the published literature [see Data]. There are dose adjustments for ascorbic acid (vitamin C) use during pregnancy [see Clinical Considerations].

Animal reproduction studies have not been conducted with ASCOR^®.

The estimated background risk of major birth defects and miscarriage for the indicated population is unknown. All pregnancies have a background risk of birth defect, loss, or other adverse outcomes. In the U.S. general population, the estimated background risk of major birth defects and miscarriage in clinically recognized pregnancies is 2-4% and 15-20%, respectively.

Clinical Considerations

Dose Adjustments During Pregnancy and Post-Partum Period

Follow the U.S. Recommended Dietary Allowances (RDA) for pregnant women when considering use of ASCOR^® for treatment of scurvy [see Dosage and Administration].

Data

Human Data

There are no available data on use of ASCOR^® or another ascorbic acid injection in pregnant women. However, a published meta–analysis of randomized studies evaluating a large number of pregnant women who took oral ascorbic acid (vitamin C) (through diet and supplementation) at doses ranging from 500 to 1000 mg/day (2.5 to 5 times the recommended daily intravenous dose, respectively) [see Dosage and Administration] between the 9th and 16th weeks of pregnancy showed no increased risk of adverse pregnancy outcomes such as miscarriage, preterm premature rupture of membranes, preterm delivery or pregnancy induced hypertension when compared to placebo. These data cannot definitely establish or exclude the absence of a risk with ascorbic acid (vitamin C) during pregnancy.

Lactation

Risk Summary

There are no data on the presence of ascorbic acid (vitamin C) in human milk following intravenous dosing in lactating women. Ascorbic acid (vitamin C) is present in human milk after maternal oral intake. Maternal oral intake of ascorbic acid (vitamin C) exceeding the U.S. Recommended Dietary Allowances (RDA) for lactation does not influence the ascorbic acid (vitamin C) content in breast milk or the estimated daily amount received by breastfed infants. There are no data on the effect of ascorbic acid (vitamin C) on milk production or the breastfed infant. The developmental and health benefits of breastfeeding should be considered along with the mother’s clinical need for ASCOR^® and any potential adverse effects on the breastfed child from ASCOR or from the underlying maternal condition. Follow the U.S. Recommended Dietary Allowances (RDA) for lactating women when considering use of ASCOR^® for treatment of scurvy [see Dosage and Administration].

Pediatric Use

ASCOR^® is indicated for the short term (up to 1 week) treatment of scurvy in pediatric patients age 5 months and older for whom oral administration is not possible, insufficient or contraindicated. The safety profile of ascorbic acid in pediatric patients is similar to adults; however, pediatric patients less than 2 years of age may be at higher risk of oxalate nephropathy following ascorbic acid administration due to age-related decreased glomerular filtration [see Warnings and Precautions]. ASCOR^® is not indicated for use in pediatric patients less than 5 months of age.

Geriatric Use

Glomerular filtration rate is known to decrease with age and as such may increase risk for oxalate nephropathy following ascorbic acid administration in elderly population [see Warnings and Precautions].

Renal Impairment

ASCOR^® should be used with caution in scorbutic patients with a history of or risk of developing renal oxalate stones or evidence of renal impairment or other issues (e.g., patients on dialysis, patients with diabetic nephropathy, and renal transplant recipients). These patients may be at increased risk of developing acute or chronic oxalate nephropathy following high dose ascorbic acid administration [see Warnings and Precautions].

OVERDOSAGE

Overdose with ascorbic acid may cause nausea, vomiting, diarrhea, facial flushing, rash, headache, fatigue or disturbed sleep. If overdose of ASCOR^® occurs, immediately discontinue administration and treat symptoms and signs of overdose, avoiding additional intake of ascorbic acid.

Customers who bought this item also bought

Mylan

Magnesium Chloride Injection 200 mg/mL, Multiple Dose Vial 50 mL, Each

$37.84

Mfg Part #: 67457-134-50

Item Code: 008680

B.Braun

0.9% Sodium Chloride IV Solution Injection, 500 mL Excel® Bag, Latex/PVC/DEPH-free, Each

$5.41

Mfg Part #: L8001 EACHES

Item Code: 005986

Codan

Swan-Lock® Needleless Connector For All IV Tubing and Luer Lock/Slip Syringes, Each

$1.75

Mfg Part #: BC1000N-S

Item Code: 006162

B.Braun

0.9% Sodium Chloride IV Solution Injection, 250 mL Excel® Bag, Latex/PVC/DEPH-free, Each

$4.62

Mfg Part #: L8002 Eaches

Item Code: 005987

Hospira

Potassium Chloride Injection 2 mEq/mL, Single Dose Vial 20 mL, Each

$11.53

Mfg Part #: 00409-6635-01

Item Code: 002812

Products specifications

Brand Name	Ascor®
Non-GMO	ASCOR® is not derived from a genetically engineered plant
No Corn Allergens	ASCOR® does not contain detectable levels of corn allergens (amino acids, proteins, polypeptides)
Generic Name	Ascorbic Acid
Generic Name	Vitamin C Injection
Medical License Required	Yes
FDA Country of Origin	United States of America
Customs Country of Origin	United States of America
Form	Pharmacy Bulk Package
Preservative-Free	Yes
Strength	500 mg/mL
Size	50 mL
Route of Administration	Intravenous (IV)
Class	Rx
Therapeutic Class	Vitamin C
Source of Vitamin C	Proprietary
Thimerosal Free	Yes
Storage Temperature	Store in refrigerator at 2º to 8º C (36º to 46º F)
Protect from Freezing	Yes
Expiration Date	2 years from date of manufacture
Protect from Light	Yes
Vial Height	3 in
Vial Diameter	1.67 in
Vial Weight (filled, without box)	0.26 lbs
Vial Stopper Diameter	0.785 in
25 Tray Pack Weight (includes vials and all packaging)	7 lbs
100 Vial Case Weight	28 lbs
Vial Stopper	Non-latex and non-allergenic
Shipping Conditions	Excursions to ambient conditions for up to 30 days during storage or shipping are acceptable.

Brands in this category

McGuff’s Promise of Quality and Service

For over 50 years, we’ve been the trusted name in healthcare excellence. Medical practitioners can rely on us for quality products, fast deliveries, and superior service. We strive for customer satisfaction and maintaining that trust.

We at the McGuff Company, Inc. (McGuff) work very hard to provide you accurate and timely information on our website. However, it is your obligation to verify such information before using the products purchased from McGuff.

All information is provided “As-is” and may change without prior notice. McGuff does not make warranty or representation that the information contained on this site is accurate, current, or complete.

Any use of information by you is without recourse to McGuff and is at your own risk.

McGuff is in no way responsible for any damages whether direct, consequential, incidental, or otherwise suffered by you or others on your behalf as a result of using or relying upon such information for any purpose.

Enter a search term.

Update on Ascor Availability