Comirnaty COVID-19 vaccine

The Pfizer-BioNTech COVID-19 vaccine, branded as Comirnaty, is an mRNA-based vaccine developed to combat COVID-19, a disease caused by the SARS-CoV-2 virus. Developed by the German biotechnology firm BioNTech in collaboration with the American pharmaceutical company Pfizer, Comirnaty is authorized for use in individuals to provide immunity against COVID-19.

Dosage form

Pack size


Each 0.3 mL dose contains 30 micrograms



Generic Name (Ingredient)

COVID-19 Vaccine, mRNA

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Comirnaty COVID-19 Vaccine Composition

Comirnaty consists of nucleoside-modified messenger RNA (modRNA) that encodes a mutated form of the SARS-CoV-2 spike protein, encapsulated in lipid nanoparticles. This formulation also includes excipients such as potassium chloride, monobasic potassium phosphate, sodium chloride, dibasic sodium phosphate dihydrate, and sucrose.


Comirnaty is indicated for active immunization to prevent COVID-19 in individuals aged 12 years and older. The vaccine aims to protect against severe illness, hospitalization, and death associated with SARS-CoV-2 infection.

Dosage and Administration


Before administration, ensure the vaccine solution is clear and free from particulate matter. Comirnaty should be used immediately after preparation.


The dosage of Comirnaty varies by age group:

  • Ages 5 to 11 years: The vaccine (orange cap formulation) requires mixing with 1.3 mL of diluent, followed by administering a 0.2 mL dose.
  • Ages 12 years and older: For the purple cap formulation, mix with 1.8 mL of diluent before administering a 0.3 mL dose. The gray cap formulation does not require dilution; a 0.3 mL dose is administered directly.


Comirnaty is administered via intramuscular injection. For individuals aged 5 to 11 years, the preferred site is the deltoid muscle. For those aged 12 years and older, the injection can be given in the deltoid or the vastus lateralis muscle in the anterolateral thigh. The vaccine is administered as a single dose, with booster doses recommended at least 2 months after the initial series.


Comirnaty is contraindicated in individuals who have experienced a severe allergic reaction (such as anaphylaxis) to any component of the vaccine. Those with a history of severe allergic reactions to a previous dose of Comirnaty should not receive it.

Warnings and Precautions

Increased Risk of Myocarditis and Pericarditis

Post-marketing data have shown an increased risk of myocarditis and pericarditis, especially within the first week following vaccination. The highest risk is observed in males aged 12 to 17 years.


Syncope (fainting) may occur following vaccination. Individuals prone to fainting should inform their healthcare provider and take precautions, such as lying down during vaccination.

Immunocompromised Persons

Those with compromised immune systems, including individuals on immunosuppressive therapy, may exhibit a reduced response to Comirnaty. It is advisable for these individuals to discuss vaccination with their healthcare provider.


While data on the risks of Comirnaty during pregnancy are limited, available animal studies have not shown harm to the fetus. Pregnant women are at increased risk for severe COVID-19, thus vaccination is recommended.

Side Effects

Like all vaccines, Comirnaty can cause side effects. Most side effects are mild to moderate and resolve within a few days.

Common Side Effects (occurring in >10% of recipients)

  • Injection site pain
  • Headache
  • Fatigue
  • Chills
  • Diarrhea
  • Fever
  • Irritability
  • Joint or muscle pain
  • Swollen or tender lymph glands
  • Unusual tiredness or weakness

Less Common Side Effects (occurring in 1-10% of recipients)

  • Nausea
  • Vomiting
  • Decreased appetite
  • General discomfort
  • Pain in the arms
  • Rash

Rare Side Effects (occurring in <1% of recipients)

  • Anxiety
  • Blue or pale skin
  • Chest discomfort or pain
  • Cough
  • Difficulty swallowing
  • Dizziness
  • Fast heartbeat
  • Fainting
  • Large hive-like swelling
  • Puffiness around the eyes, lips, or tongue
  • Breathing difficulties

These side effects typically do not require medical attention and may subside as the body adjusts to the vaccine. However, persistent or bothersome side effects should be discussed with a healthcare provider.

Drug Interactions

Comirnaty has potential interactions with numerous medications. Known drug interactions include:

Major interactions: Highly clinically significant; avoid combinations.
Moderate interactions: Moderately clinically significant; usually avoid combinations unless necessary.
Minor interactions: Minimally clinically significant; minimize risk through monitoring.

Frequently checked interactions involve medications like prednisone, methotrexate, and triamcinolone. It is crucial to inform healthcare providers about all medications being taken to assess potential interactions.

Pregnancy and Lactation


COVID-19 vaccination is recommended for pregnant individuals to protect against severe disease. Studies indicate that vaccination before and during pregnancy is safe, effective, and beneficial for both the mother and baby. Pregnant women are prioritized for vaccination due to the increased risk of severe illness from COVID-19.


Breastfeeding individuals can safely receive the COVID-19 vaccine. The vaccine does not transmit COVID-19 through breast milk. Vaccination is recommended for infants aged 6 months and older, regardless of maternal vaccination status.


There is no evidence that COVID-19 vaccines affect fertility in men or women. Concerns about fertility issues related to vaccination are not supported by scientific data.


Information on overdosage is limited. Adherence to recommended dosage and administration guidelines is crucial for safety and efficacy.


Comirnaty’s storage requirements vary by formulation and target age group. For detailed storage instructions, refer to official guidelines.

Allergies and Comirnaty

Individuals with allergies can receive Comirnaty, but precautions are necessary:

  • Severe allergic reactions to any component of the vaccine contraindicate its use.
  • Mild allergic reactions to other vaccines may require observation post-vaccination.
  • Vaccine-related allergic reactions are rare and often mild, typically due to vaccine additives rather than the mRNA itself.

Age Recommendations

Comirnaty is recommended for individuals aged 12 years and older. For children aged 6 months to 4 years, specific guidelines apply. Always consult with healthcare providers or local health authorities for the most current recommendations.

Table: Comirnaty Overview

Aspect Information
Uses Epileptic conditions, seizure prevention post-surgery or injury, trigeminal neuralgia
Mechanism of Action Alters sodium ion movement, stabilizes neuronal membranes, reduces seizure activity
Dosage Adults: Initial 3-4 mg/kg daily, max 600 mg; Children: Initial 5 mg/kg daily, max 300 mg
Administration Oral, with water, same time daily
Precautions Avoid if allergic to phenytoin/hydantoins, liver disease, porphyria, suicidal thoughts risk, serious skin reactions, drug interactions
Side Effects Headaches, drowsiness, dizziness, nausea, constipation, sore gums, mild skin rash
Benefits Controls epileptic conditions, prevents seizures, treats trigeminal neuralgia, antiarrhythmic properties


Comirnaty (Pfizer-BioNTech COVID-19 vaccine) is a vital tool in the fight against COVID-19, providing significant protection against the virus. While generally safe and effective, it is essential to follow medical guidance regarding its use, particularly for individuals with specific health conditions or those taking other medications. Regular consultation with healthcare professionals ensures safe vaccination practices and optimal protection against COVID-19.


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The information on this page is not intended to be a substitute for professional medical advice, diagnosis, or treatment. always seek the advice for your physician or another qualified health provider with any questions you may have regarding a medical condition. Always remember to

  1. Ask your own doctor for medical advice.
  2. Names, brands, and dosage may differ between countries.
  3. When not feeling well, or experiencing side effects always contact your own doctor.


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