Ammonia N-13: uses, dosing, side effects & brands

Ammonia N-13 is a radioactive diagnostic agent sold in the U.S. under one brand. Below: what the FDA label says, every product that contains it, what the pills look like, and its recall record.

By the pharmaranks editorial teamReviewed against the FDA (openFDA label, NDC Directory & Enforcement) sourcesUpdated Jul 24, 2026How we research

Key facts

Drug class: Radioactive Diagnostic Agent
Available as: Injectable · Solution
Sold as: Ammonia N 13
Prescription?: Prescription only
Generic available?: Not in our catalog

How ammonia n-13 is dosed

From the FDA label for Ammonia N 13 (application NDA022119). Other ammonia n-13 products — different forms, different strengths — are dosed differently. Follow the label for the one you were prescribed.

Rest Imaging Study ( 2.1 ): • Aseptically withdraw Ammonia N 13 Injection from its container and administer 10-20 mCi (0.370 – 0.740 GBq) as a bolus through a catheter inserted into a large peripheral vein. • Start imaging 3 minutes after the injection and acquire images for a total of 10-20 minutes. Stress Imaging Study ( 2.2 ): • If a rest imaging study is performed, begin the stress imaging study 40 minutes or more after the first Ammonia N 13 Injection to allow sufficient isotope decay. • Administer a pharmacologic stress-inducing drug in accordance with its labeling. • Aseptically withdraw Ammonia N 13 Injection from its container and administer 10-20 mCi (0.370 – 0.740 GBq) of Ammonia N 13 Injection as a bolus at 8 minutes after the administration of the pharmacologic stress-inducing drug. • Start imaging 3 minutes after the Ammonia N 13 Injection and acquire images for a total of 10-20 minutes. Patient Preparation ( 2.3 ): • To increase renal clearance of radioactivity and to minimize radiation dose to the bladder, hydrate the patient before the procedure and encourage voiding as soon as each image acquisition is completed and as often as possible thereafter for at least one hour. 2.1 Rest Imaging Study • Aseptically withdraw Ammonia N 13 Injection from its container and administer 10-20 mCi (0.370 – 0.740 GBq) as a bolus through a catheter inserted into a large…

Ammonia N-13 side effects

No adverse reactions have been reported for Ammonia N 13 Injection based on a review of the published literature, publicly available reference sources, and adverse drug reaction reporting systems. However, the completeness of these sources is not known. No adverse reactions have been reported for Ammonia N 13 Injection based on a review of the published literature, publicly available reference sources, and adverse drug reaction reporting system. To report SUSPECTED ADVERSE REACTIONS, contact The Feinstein Institutes for Medical Research at 516-562-1052 or FDA at 1-800-FDA-1088 or www.fda.gov/medwatch .

Who shouldn’t take ammonia n-13

None None

Ammonia N-13 drug interactions

The possibility of interactions of Ammonia N 13 Injection with other drugs taken by patients undergoing PET imaging has not been studied.

Every ammonia n-13 product we track (1)

Same active ingredient — different manufacturer, form, price and FDA recall record. That last one is what our independent score measures.

Only one: Ammonia N 13.

How long ammonia n-13 keeps

No ammonia n-13 label we read sets a separate limit for after opening, but they do specify how it must be stored — and the stability behind any date assumes those conditions.

Does ammonia n-13 expire? The in-use limits and storage rules from its labels

What people report to the FDA about ammonia n-13

The FDA Adverse Event Reporting System (FAERS) collects reports from patients and clinicians. It holds 2 reports naming ammonia n-13, and the FDA flagged 100% of those reports as serious. The effects reported most often — leaving out reports about overdose, misuse or the condition being treated, which dominate the raw list for common medicines:

acute myocardial infarction1 reports

Read these as a signal, not a rate. A report does not mean ammonia n-13 caused the effect — anyone can file one, and many describe people taking several medicines for several conditions. Crucially there is no denominator: FAERS does not record how many people took the drug, so these counts cannot be turned into “X% of patients” — a bigger number often just means a more widely used or more talked-about drug. Duplicates exist, and publicity drives reporting. For what is actually established, read the FDA label section above.

Source: openFDA drug/event (FAERS), retrieved July 25, 2026.

Related calculators

How long it stays in your system →

Frequently asked questions

What is ammonia n-13?

Ammonia N 13 (Ammonia N-13) is a radioactive diagnostic agent.

What kind of drug is ammonia n-13?

The FDA classifies ammonia n-13 as a radioactive diagnostic agent. A radioactive diagnostic agent is a small dose of a radioactive substance attached to a molecule that travels to a specific organ or tissue. Once there it gives off radiation that a scanner outside the body detects, producing images that show where that tissue is or how it is working. If you are checking whether it is safe to combine with something else, the class is what matters — two drugs from the same class usually should not be stacked.

Can you take ammonia n-13 with other medicines?

It depends on the medicine. We check it against the FDA labels rather than guessing: our interaction checker searches each drug's own label for the other and quotes what it says, naming the section it came from. Run ammonia n-13 against whatever else you take — and remember that a label not naming a drug is not the same as that combination being safe.

What forms does ammonia n-13 come in?

Across the brands we track, ammonia n-13 is currently marketed as injectable and solution, per the FDA's National Drug Code Directory. Each form is dosed differently — follow the label for the exact product you were prescribed.

Is there a generic ammonia n-13?

We do not currently list a generic-labelled ammonia n-13 product. That does not always mean none exists — it means none appears under a generic name in the FDA data we track. Ask your pharmacist.

Cite this page

APA: pharmaranks. (2026, July 24). Ammonia N-13: uses, dosing, side effects & brands. https://pharmaranks.com/drugs/ammonia-n-13
MLA: “Ammonia N-13: uses, dosing, side effects & brands.” pharmaranks, 24 July 2026, https://pharmaranks.com/drugs/ammonia-n-13.

We summarise public FDA and NIH sources — for a clinical claim, cite the primary source we link to as well.

Sources: FDA openFDA drug label, National Drug Code Directory, and Enforcement (recall) database. This page reproduces public FDA data and is not medical advice. Dosing is set by your prescriber.

Read the full FDA label for ammonia n-13 on DailyMed (NIH) ↗.