You are here
Home > RX List

Search© Drug Database

Enter drug's generic or brand name below. Results will appear here. Note: all drug related information obtained on this page is provided by RX List.

Using the RX LIST database:
(1) Enter the drug name in the search box below and hit ENTER
(2) The rx list web site will open here with the drug search completed. Next, scroll down the page to locate the link to the drug you are searching for and then click on the link.

Alphabetical Listing of drugs

a b c d e f g h i j k l m
n o p q r s t u v w x y z

Drug Description

CaloMist Nasal Spray
(cyanocobalamin, USP)


Cyanocobalamin is a synthetic form of vitamin B12 with activity equivalent to the endogenous form of vitamin B12. The chemical name is α-(5,6-dimethylbenzimidazolyl) cyanocobamide. The cobalt content is 4.35%. The molecular formula is C63H88CoN14O14P, which corresponds to a molecular weight of 1355.4 and the following structural formula:

CaloMist Nasal Spray (cyanocobalamin, USP) Structural Formula Illustration

Cyanocobalamin occurs as dark red crystals, orthorhombic needles, or crystalline red powder and is very hygroscopic in the anhydrous form, and sparingly to moderately soluble in water (1:80). The pharmacologic activity of cyanocobalamin is destroyed by heavy metals (iron) and strong oxidizing or reducing agents (Vitamin C), but not by autoclaving for short periods of time (15-20 minutes) at 121° C. The vitamin B12 coenzymes are very unstable in light.

Each bottle of CaloMist Nasal Spray contains cyanocobalamin, sodium chloride, sodium phosphate monobasic, benzyl alcohol, sodium hydroxide, and benzalkonium chloride in purified water with an attached spray pump unit.

Indications & Dosage


Vitamin B12 Maintenance Therapy

CaloMist is indicated for maintenance of vitamin B12 concentrations after normalization with intramuscular vitamin B12 therapy in patients with vitamin B12 deficiency who have no nervous system involvement.

Limitations Of Use

CaloMist has not been evaluated for the treatment of newly diagnosed vitamin B12 deficiency.

CaloMist is not suitable for use in the vitamin B12 absorption test (Schilling Test).

The effectiveness of CaloMist in patients with nasal pathology (e.g., nasal congestion, allergic rhinitis, upper respiratory infections) has not been determined. Treatment with CaloMist should be deferred until nasal symptoms have subsided [see WARNINGS AND PRECAUTIONS].


Recommended Dosage

The recommended initial dose of CaloMist is one spray in each nostril once daily (25 mcg per nostril, total daily dose 50 mcg). The dose should be increased to one spray in each nostril twice daily (total daily dose 100 mcg) for patients with an inadequate response to once daily dosing.

The dosing of CaloMist and other intranasal medications should be separated by several hours, and these patients should have more frequent monitoring of vitamin B12 concentrations because of the potential for erratic absorption.

Priming (Activation) Of Pump

The pump must be primed before the bottle is used for the first time. To prime the pump, place the nozzle between the first and second finger with the thumb on the bottom of the bottle. Pump the unit firmly and quickly then repeat this priming an additional 6 times for a total of 7 priming sprays. Now the nasal spray is ready for first-time use. If 5 or more days elapse since last use, the pump must be reprimed with two re-priming sprays.

Refer to Patient Labeling (Instructions for Use) for detailed information.


Dosage Forms And Strengths

Nasal Spray: CaloMist (cyanocobalamin, USP) Nasal Spray is a solution of cyanocobalamin, USP, for administration as a metered spray to the nasal mucosa. Each bottle of CaloMist contains 10.7 mL of a 25 mcg of cyanocobalamin in a 0.1 mL of solution per spray. After initial priming, each spray delivers 25 mcg of cyanocobalamin. Each bottle will deliver 60 sprays for a total of thirty 50 mcg doses of CaloMist.

Storage And Handling

CaloMist is provided in a carton containing one bottle of nasal spray solution affixed with a nasal spray pump, a package insert, and a patient instruction sheet. CaloMist is available as a metered dose spray in 30 mL plastic bottles containing 10.7 mL of solution. CaloMist is available in a dosage strength of 25 mcg cyanocobalamin, USP, per 0.1 mL of spray solution. One bottle delivers thirty 50 mcg doses (60 sprays) (NDC 0256-0203-01).


Store upright at room temperature between 59 °F to 86 °F (15 °C to 30 °C).

Protect from heat and light.

Protect from freezing.

Manufactured by: Fleming Pharmaceuticals, St. Louis County, MO 63026 USA. Revised: Jan 2020


According to the USDA, there is no difference between a “portion” and a “serving.” See Answer
Side Effects & Drug Interactions


Clinical Trials Experience

Because clinical trials are conducted under widely varying conditions, adverse reaction rates observed in the clinical trials of a drug cannot be directly compared to rates in the clinical trials of another drug and may not reflect the rates observed in practice.

The data described below and in Table 1 reflect exposure in 25 subjects (age range 27-82 years; 17 women; 21 Caucasians) with vitamin B12 deficiency (12 with pernicious anemia, 4 secondary to gastrointestinal surgery, 9 with unknown cause) who received CaloMist 50 mcg daily for 8 weeks in an uncontrolled clinical trial. Prior to enrollment, all subjects were required to have normal vitamin B12 levels with intramuscular vitamin B12 injections. One patient who completed the study developed epistaxis on Day 12 of dosing and was noted to have irritation of the right nasal septum at study end. This patient had pre-existing allergic rhinitis and required a doubling of the CaloMist dose during the last week of the study because of declining vitamin B12 concentrations.

Table 1: Potentially related adverse reactions reported during 8 weeks of treatment with CaloMist in an uncontrolled clinical trial.

Adverse ReactionCaloMist
(N=25) n (%)
Arthralgia3 (12%)
Dizziness3 (12%)
Headache3 (12%)
Nasopharyngitis3 (12%)
Rhinorrhea3 (12%)
Bronchitis2 (8%)
Nasal Discomfort2 (8%)
Pain2 (8%)
Rash2 (8%)
Asthma1 (4%)
Back Pain1 (4%)
Cough1 (4%)
Epistaxis1 (4%)
Hypersomnia1 (4%)
Influenza Like Illness1 (4%)
Malaise1 (4%)
Pharyngolaryngeal Pain1 (4%)
Postnasal Drip1 (4%)
Procedural Pain1 (4%)
Pyrexia1 (4%)
Scab1 (4%)
Sinus Headache1 (4%)
Sinusitis1 (4%)
Tooth Abscess1 (4%)

Experience With Parenteral Vitamin B12

The following adverse reactions have been reported with parenteral vitamin B12:

Generalized:Anaphylactic shock and death
Cardiovascular:Pulmonary edema and congestive heart failure early in
treatment, peripheral vascular thrombosis
HematologicalPolycythemia vera
Gastrointestinal:Mild transient diarrhea
Dermatological:Itching; transitory exanthema

Postmarketing Experience

The following adverse reactions have been identified during postapproval use of cyanocobalamin. Because these reactions are reported voluntarily from a population of uncertain size, it is not always possible to reliably estimate their frequency or establish a causal relationship to drug exposure.

Angioedema and angioedema-like reactions [see WARNINGS AND PRECAUTIONS].


No Information provided

Warnings & Precautions


Included as part of the PRECAUTIONS section.


Laboratory Monitoring

Obtain hematocrit, reticulocyte count, vitamin B12, folate, and iron levels prior to treatment. All hematologic parameters, including vitamin B12 concentrations, should be normal before initiating treatment with CaloMist. Monitor serum vitamin B12 concentrations periodically to confirm adequacy of therapy. Monitor Vitamin B12 concentrations and complete blood counts one month after starting CaloMist and then at 3 to 6 month intervals thereafter. Monitor methylmalonic acid and homocysteine concentrations in patients with borderline-low vitamin B12 concentrations (<300 ng/L) as these are more sensitive measures of vitamin B12 deficiency in this setting. Switch back to intramuscular route of administration for patients with declining or abnormally low vitamin B 12 concentrations despite maximal doses of CaloMist. Vitamin B12 deficiency that is inadequately treated for longer than three months may produce irreversible neurological damage.

Use In Patients With Nasal Pathology

CaloMist has not been evaluated in patients with nasal pathology. In patients with nasal pathology, defer treatment with CaloMist until nasal symptoms have subsided. Patients with chronic nasal symptoms or significant nasal pathology are not ideal candidates for intranasal vitamin B12 therapy. If CaloMist therapy is attempted in these patients, monitor vitamin B12 concentrations more frequently than in patients without nasal pathology because of the potential for erratic or blunted absorption.

Use In Patients With Leber’s Disease

Patients with early Leber’s disease (hereditary optic nerve atrophy) who were treated with cyanocobalamin suffered severe and swift optic atrophy. Cyanocobalamin is not recommended for use in these patients.

Anaphylaxis And Angioedema

Anaphylactic shock, death, and angioedema were not reported in the CaloMist clinical trial but have been reported with parenteral vitamin B12 administration.

Megaloblastic Anemia

Megaloblastic anemia has many causes, including vitamin B12 deficiency and folate deficiency. Folic acid may result in a hematological response in patients with vitamin B12 deficiency but will not prevent irreversible neurological manifestations. Vitamin B12 is not an appropriate treatment for folate deficiency.

Hypokalemia, thrombocytosis, and sudden death may occur when severe megaloblastic anemia is treated intensely with vitamin B12. Monitor serum potassium and platelet counts more frequently in this setting.

Blunted Response To Vitamin B12 Therapy Infections, uremia, concurrent iron or folic acid deficiency, and drugs with bone marrow suppressant properties (e.g., chloramphenicol) may blunt the therapeutic response to vitamin B12 products, including CaloMist.

Patient Counseling Information

  • Advise the patient to read the FDA-approved patient labeling (Instructions for Use)
  • Important Information For Patients
  • Advise patients with a chronic underlying cause of vitamin B12 deficiency that they will require indefinite administration of a vitamin B12 product, such as CaloMist. Noncompliance or inadequate treatment with vitamin B12 therapy may result in recurrence of anemia and the development or worsening of irreversible neurological damage.
  • Advise patients to separate the dosing of CaloMist and other intranasal medications by several hours.
  • Advise patients that Vitamin B12 levels will be monitored one month after CaloMist initiation or dose change and every 3-6 months thereafter.
  • Instruct patients on how to prime the actuator and administer the dose of CaloMist. Have the patient demonstrate the administration procedure.

Nonclinical Toxicology

Carcinogenesis, Mutagenesis, Impairment Of Fertility

There are no long-term studies in animals that have evaluated the carcinogenic potential of any of the vitamin B12 products, including CaloMist. There is no evidence from long-term use in patients with pernicious anemia that vitamin B12 is carcinogenic. Pernicious anemia is associated with an increased incidence of carcinoma of the stomach, but this malignancy has been attributed to the underlying pathology of pernicious anemia and not to treatment with vitamin B12.

No studies have been performed to evaluate the potential of CaloMist for genotoxicity.

Animal reproduction studies assessing the effects of CaloMist on male and female fertility have not been conducted.

Use In Specific Populations


Risk Summary

Administration of the approved recommended dose of CaloMist is not expected to cause major birth defects, miscarriage or adverse maternal or fetal outcomes. Animal reproduction studies have not been conducted with CaloMist nasal spray. There are risks associated with vitamin B12 deficiency during pregnancy (see Clinical Considerations).

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

Disease-Associated Maternal And/Or Embryo/Fetal Risk

Severe maternal vitamin B12 deficiency during pregnancy may result in adverse pregnancy outcomes such as low birth weight, preterm birth and megaloblastic anemia.


Risk Summary

Vitamin B12 is present in human milk. Administration of the approved recommended dose of CaloMist is not expected to cause harm to a breastfed child. There is no information on the effects of CaloMist on the breastfed child or on milk production. The developmental and health benefits of breastfeeding should be considered along with the mother’s clinical need for CaloMist and any potential adverse effects on the breastfed infant from the underlying maternal condition.

Pediatric Use

Safety and effectiveness in pediatric patients have not been established.

Geriatric Use

Clinical studies of CaloMist did not include sufficient numbers of subjects aged 65 and over to determine whether they respond differently from younger subjects. Other reported clinical experience has not identified differences in responses between the elderly and younger patients. In general, dose selection for an elderly patient should be cautious, usually starting at the low end of the dosing range, reflecting the greater frequency of decreased hepatic, renal, or cardiac function, and of concomitant disease or other drug therapy.

Renal/Hepatic Impairment

Patients with vitamin B12 deficiency and concurrent renal or hepatic disease may require increased doses or more frequent administration of vitamin B12 therapy.

Overdosage & Contraindications


No Information provided


CaloMist is contraindicated in patients with sensitivity to cobalt, vitamin B 12, or any component of this product. Reactions following administration of parenteral vitamin B12 have included: anaphylactic shock, death, and angioedema [see WARNINGS AND PRECAUTIONS].

Clinical Pharmacology


Mechanism Of Action

Vitamin B12 is essential for growth, cell reproduction, hematopoiesis, and nucleoprotein and myelin synthesis. Rapidly dividing cells (e.g., epithelial cells, bone marrow, myeloid cells) have the greatest requirement for vitamin B12. In tissues, vitamin B12 is essential for the conversion of methylmalonate to succinate and for the synthesis of methionine from homocysteine. In the absence of vitamin B12, tetrahydrofolate cannot be regenerated from 5-methyl tetrahydrofolate, and functional folate deficiency occurs. Vitamin B12 also may be involved in sulfhydryl-activated enzyme systems associated with fat and carbohydrate metabolism and protein synthesis.


In 24 vitamin B12 deficient patients who were stabilized on intramuscular (IM) vitamin B12 therapy, once daily intranasal dosing with CaloMist for 8 weeks resulted in serum vitamin B12 concentrations that were within the target range (>200 ng/L) and slightly higher than those seen 2 to 4 weeks after administration of IM vitamin B12 (see Figure 1 - average mean increase from Visit 1 to Visits 3-6 = 45 ng/L). Twenty-three of these 24 patients received 50 mcg of CaloMist daily for the duration of the trial; the remaining patient required doubling of the CaloMist dose from 50 mcg to 100 mcg daily during the last week of the study because of declining vitamin B12 concentrations. One of the 25 patients dosed with CaloMist was excluded from the efficacy analyses because a diagnosis of vitamin B12 deficiency could not be confirmed.

Figure 1: Mean Vitamin B12 Serum Levels Over 8 Weeks of Intranasal (IN) Vitamin B12 Dosing in 24 Subjects Stabilized on Intramuscular (IM) Vitamin B12

Mean Vitamin B<sub>12</sub> Serum Levels Over 8 Weeks
of Intranasal (IN) Vitamin B<sub>12</sub> Dosing in 24 Subjects Stabilized on Intramuscular
(IM) Vitamin B<sub>12</sub> - Illustration


  • Weeks -2 to -4 correspond to 2 to 4 weeks post last IM injection
  • CaloMist was initiated at Week 0
  • Figure shows mean vitamin B12 serum levels with 95% confidence intervals.



In the blood, vitamin B12 is bound to transcobalamin II (a specific B-globulin carrier protein) and is distributed to tissues and stored primarily in the liver and bone marrow.


About 3-8 mcg of vitamin B12 is secreted into the gastrointestinal tract daily via the bile. In subjects with sufficient intrinsic factor, all but about 1 mcg is reabsorbed. When vitamin B12 is administered in doses that saturate the binding capacity of plasma proteins and the liver, the unbound vitamin B12 is rapidly eliminated in the urine. Retention of vitamin B12 in the body is dose-dependent.

Medication Guide


No information provided. Please refer to the WARNINGS AND PRECAUTIONS section.

From WebMD Logo

Nutrition and Healthy Eating Resources
  • Foods That Fight Inflammation
  • Foods to Control Your Blood Sugar
  • Good and Bad Foods for Psoriasis
Featured Centers
  • 7000
  • Video: Emotional Resilience
Health Solutions From Our Sponsors
  • Is It Normal to Have a Curved Penis?

Health Solutions From Our Sponsors

  • Penis Curved When Erect
  • Fight Against Cancer
  • Caring For Your Dog
  • Safe ED Meds Online
  • Dupuytren’s Treatment
  • New Cancer Treatments

RX List