Should I Get Another Shingrix Shot If I'm Unsure I Got Dose 2?

Thanks for using HelloPharmacist! This is a great question that I'm sure is tough to find a good answer online to.

The good news is that you're likely in a low-risk situation either way.

Before assuming anything, though, there are a few easy ways to track down whether you actually received that second dose. If the record truly can't be found, receiving another dose of Shingrix may be reasonable after discussing the situation with your pharmacist or doctor.

A third dose isn't routinely recommended, and evidence specifically studying unintended third doses is limited, but an extra dose isn't expected to create a special safety concern beyond the usual short-term side effects.

How to Track Down Your Vaccination Record

Your first step should be checking with the pharmacy or doctor's office where you got your first dose, since they will have a record of anything given there.

Beyond that, nearly every state maintains an immunization registry that pharmacies and clinics report vaccinations to, and your doctor or pharmacist can usually look you up in it.

Many pharmacy chains can also pull up your vaccination history at any of their locations, not just the one you visited.

It's worth spending a few minutes on this before getting another shot, simply because a documented record gives you a clear answer. Keep in mind, though, that adult immunization registries aren't always complete, particularly for vaccines given many years ago or in another state.

Why Completing Both Doses Matters

Shingrix is given as a two-dose series, with the second dose recommended 2 to 6 months after the first, because two doses produce a stronger and longer-lasting immune response than one.

If more than six months have passed since the first dose, you don't need to restart the series. The CDC recommends simply receiving the missing second dose as soon as possible.

A large real-world study of Medicare beneficiaries over 65 found the vaccine was about 70% effective against shingles with two doses compared to about 57% with just one, and the authors specifically emphasized the value of finishing the series.

So if there's a real chance you never got dose two, it's worth making sure you're fully protected rather than leaving it to chance, especially at 78, since the risk of shingles and its complications rises with age.

Safety of a Possible Extra Dose

Now for the heart of your question: is an extra dose risky?

Shingrix is a recombinant, non-live vaccine, meaning it contains a protein from the virus rather than the live virus itself, so it cannot replicate in your body or cause shingles.

If it turns out you already had two doses and received a third, the main expectation would be the same short-term side effects the vaccine is already known for, such as a sore arm, fatigue, muscle aches, headache, or a low-grade fever for a day or two.

An extra dose isn't recommended as routine practice, and the CDC doesn't specifically recommend a third Shingrix dose solely because a record can't be located. However, general vaccine guidance also says that recommended vaccination shouldn't necessarily be postponed when reliable records aren't available. In practice, your pharmacist or doctor can weigh the likelihood that you already completed the series against the risk of leaving you potentially under-protected.

Your pharmacist and doctor can confirm the best approach with you at the time of the appointment.

Final Words

Start by asking your pharmacy, your doctor's office, or your state immunization registry to check your records, since there's a good chance the answer is already documented somewhere.

If it truly can't be confirmed, receiving another Shingrix dose may be a reasonable step after discussing it with your pharmacist or doctor.

It wouldn't be a routinely recommended third dose, but it also isn't expected to create a special safety concern beyond possibly a sore arm and a tired day or two. Be sure to ask your doctor first, though, regarding the best course for your specific medical situation.