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Prednisone: Flu shot or not?

Prednisone: Flu shot or not?

Prednisone: Flu shot or Not?

Should you get a flu shot 💉 while taking prednisone 💊 or not?

A Prednisone Warriors wife asked, “My husband is on Prednisone. Should he get a flu shot or not? And if so, what dose?”

I will answer her question and other questions about the flu shot, speaking as the Prednisone Pharmacist.

Once upon a time, I gave 200 flu shots in one day! It was the craziest day!

Full disclosure: I am a certified immunizer. Although it’s been a while since I’ve given one, I have given lots of flu shots in my pharmacy career.

Should I get a flu shot while taking prednisone?

First of all should you get one or not? It’s kind of confusing because prednisone can cause immunosuppression. So does that mean you shouldn’t get flu shots? Here’s the answer: there are different kinds of flu vaccines.

  1. Nose Spray: There’s the nasal spray and that is a live vaccine. It’s made of a live attenuated influenza virus and that one isn’t really safe for people on prednisone. Everybody on Prednisone should pretty much avoid the nasal spray
  2. Injection: The injection, the vaccine that goes in your arm, that one should be safe for people on prednisone because it’s not a live vaccine. It’s what they call inactivated. It’s like a killed virus and so it’s not as harmful for people on prednisone.

In fact the injection of the vaccine is really good because it helps you to prevent what could be potentially fatal: the flu. You do not want to get the flu while you’re on Prednisone because you’d have a hard time fighting it.

Is there an interaction between prednisone and the flu vaccine?

No, there is not an interaction between prednisone and the injection of inactivated influenza virus vaccine.

Should I get a high-dose flu vaccine or not?

This Prednisone Warrior, he’s over age of 65 and that’s the only people who really need high-dose and so yes, he should get high-dose because of his age. You can get the high-dose vaccine if you’re over 65 pretty much no problem if you’re taking prednisone. 

Does it matter which dose of Prednisone?

If you are taking Prednisone for less than two weeks and it a dose of less than 20 mg, then there’s no reason to wait to get your flu shot. For those who are going to be taking prednisone longer, get your flu vaccine now. Get that protection in you! 

When should you get your flu vaccine?

Now is a good choice because it’s in stock and with the epidemic might not be people might demand it, and it might run out. 

When is the flu vaccine most effective? 

It is very most effective if you get it in October. If you get it before October, it’s good for the flu season but October gives you six months of flu season coverage. There’s not a lot of evidence that the flu shot last longer than 6 months, so if you get in August, the protection is going to start running out in February. The flu season continues through April, so you have two months that you still need to fight. So the very, very best time is October because you’re getting it right before the flu season gets strong but enough time that it’s going to last throughout the flu season. 

Does the flu shot give you the flu? 

The answer is no. But do some people feel “flu-ish”? Yes. It is common to have a very slight fever. The flu shot can make you feel like you have the flu, but it’s not actually the flu. It’s just your body’s immune response to the vaccine. Definitely report if you’re getting extremely high fever or extreme symptoms–that is to be expected. The vaccine is doing its job and so no, that’s not the flu. It’s working.

Does the flu vaccine sometimes not work?

When they make the flu vaccine, the scientists have to guess about a year to six months in advance of the flu season what the flu is going to look like. That means they have to guess how the virus is going to replicate. That’s kind of tricky to do and they can guess wrong. It’s all based on what the flu was like on the other side of the world and sometimes by the time it’s gotten all the way to the northern hemisphere it’s changed and it doesn’t match anymore. Some years it’s really great match and you’re really glad you got your flu shot. Other years it does not match as well. In that case, the vaccine protects you from a virus that is no longer circulating. The new virus can make you sick. It doesn’t mean the flu vaccine doesn’t work; it means the match failed.

Finally, am I going to get the flu vaccine?

Yep! I’m taking all my kids in October to get our flu shots. Why? Because I have no desire to have a bunch of kids with the flu and wondering whether they have flu or COVID

So… are you going to get your flu shot?


Official Scientific Statements on Prednisone and Influenza Vaccine

CDC Statement: What is Immunosuppression?

A substantially immunosuppressive steroid dose is considered to be ≥2 weeks of daily receipt of 20 mg or 2 mg/kg body weight of prednisone or equivalent.

Two conditions are temporary contraindications to vaccination with live vaccines: pregnancy and immunosuppression.

Use of aerosolized steroids, such as inhalers for asthma, is not a contraindication to vaccination; nor are alternate-day, rapidly tapering, and short (less than 14 days) high-dose schedules, topical formulations, and physiologic replacement steroid dose schedules.

CDC Statement on Immunocompromised Persons

Immunocompromised persons should receive an age-appropriate IIV or RIV4.
LAIV4 (nasal spray) should not be used for immunocompromised persons.
Immune response to vaccines might be blunted in immunocompromised persons, and might be reduced or minimal as a result of medications, chemotherapy, or transplant regimens.
Timing vaccination during some period either before or after interventions which compromise immunity may be appropriate. The Infectious Diseases Society of America (IDSA) has published guidance concerning the timing of vaccination in relation to such interventions.

CDC Statement on Corticosteroids like Prednisone

The amount of systemically absorbed corticosteroids and the duration of administration needed to suppress the immune system of an otherwise immunocompetent person are not well defined. Although the immunosuppressive effects of steroid treatment vary, the majority of clinicians consider a dose equivalent to either ≥2 mg/kg of body weight or ≥20 mg/day of prednisone or equivalent for persons who weigh >10 kg when administered for ≥14 consecutive days as sufficiently immunosuppressive to raise concern about the safety of vaccination with live-virus vaccines (37). This dosage is referred to as “high-dose corticosteroids”. Corticosteroids used in greater than physiologic doses also can reduce the immune response to vaccines. Vaccination providers should defer live-virus vaccination for at least 1 month after discontinuation of high-dose systemically absorbed corticosteroid therapy administered for ≥14 days. Following vaccination, the decision needs to be made when to restart immunosuppressive therapy. There are no specific recommendations about when to restart immunosuppressive medicines. However, when initiating immunosuppressive therapy, providers should wait 4 weeks after a live vaccine and 2 weeks after an inactivated vaccine. However, if patients require therapy for chronic inflammatory conditions, this therapy should not be delayed because of past administration of vaccines (1).

Corticosteroid therapy usually is not a contraindication to administering live-virus vaccine when administration is 1) short term (i.e., <14 days); 2) a low to moderate dose (i.e., <20 mg of prednisone or equivalent per day or <2mg/kg body weight per day for a young child); 3) long-term, alternate-day treatment with short-acting preparations; 4) maintenance physiologic doses (replacement therapy); or 5) topical (skin or eyes), inhaled, or by intra-articular, bursal, or tendon injection (37). No evidence of an increased risk for more severe reactions to live, attenuated viral vaccines has been reported among persons receiving corticosteroid therapy by aerosol, and such therapy is not a reason to delay vaccination.

Study on Children and Influenza Virus

Prednisone bursts did not diminish the response of asthmatic children to the 1996 influenza virus vaccine, compared with controls. Children can be effectively vaccinated against influenza virus while they are receiving prednisone therapy bursts for asthmatic exacerbations.

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