Shingrix causes noticeable side effects in most people who receive it. Injection site pain is the most common, affecting about 78% of adults across clinical trials. Systemic reactions like muscle aches, fatigue, and headache are also frequent. The good news: these side effects typically resolve within two to three days and are a sign your immune system is responding to the vaccine.
Injection Site Reactions
Pain at the injection site is by far the most reported side effect, though the rate varies by age. In clinical trials, 88% of adults aged 50 to 59 experienced arm pain, compared to 83% of those in their 60s and 69% of adults 70 and older. For most people, this means a sore arm similar to what you’d feel after a flu shot, only more intense.
Redness at the injection site occurs in about 38% of recipients across all age groups. Swelling is somewhat less common, affecting 31% of adults in their 50s, 27% in their 60s, and 23% of those 70 and older. A small percentage of people develop redness or swelling larger than about four inches across, but this is uncommon (around 1 to 3% of recipients).
Whole-Body Side Effects
Shingrix doesn’t just cause a sore arm. Many people experience body-wide symptoms in the week following vaccination, including fatigue, muscle pain, headache, shivering, fever, and occasionally stomach upset. These reactions reflect the immune system ramping up its defenses against the varicella-zoster virus.
About 4 to 10% of trial participants reported Grade 3 pain, defined as pain severe enough to prevent normal everyday activities. Younger recipients were more likely to fall into this category: 10% of adults in their 50s compared to 4% of those 70 and older. So while older adults are less likely to have intense reactions, a meaningful number of people across all ages will feel genuinely unwell for a day or two.
Second Dose vs. First Dose
Side effects tend to be more common after the second dose of Shingrix than after the first. If your first shot went smoothly, you may still have a stronger reaction the second time around. This is normal and expected. In clinical trial data from stem cell transplant recipients, pain rates were similar between doses (around 74 to 82%), but redness and swelling were slightly higher after the second dose.
Even if you had a rough time with the first shot, completing the two-dose series is important. The CDC encourages patients to get the second dose even after experiencing significant reactions, as long as they didn’t have an anaphylactic (severe allergic) reaction. Without both doses, your protection against shingles drops considerably.
How Long Side Effects Last
Most side effects appear within the first day or two and resolve on their own within about 72 hours. Some people feel fine within a day, while others may feel wiped out for two to three days. Local reactions like redness and swelling at the injection site can linger slightly longer but generally follow the same timeline. Planning your vaccination before a day when you don’t have major obligations can make the recovery period more manageable.
Managing Discomfort After Your Shot
A cold compress on the injection site can help with pain, redness, and swelling. Moving your arm throughout the day, rather than keeping it still, often reduces stiffness. Over-the-counter pain relievers can help with both arm soreness and body-wide symptoms like headache and muscle aches. Staying hydrated and resting when you need to are the most practical steps you can take. The CDC notes that while side effects may temporarily interfere with daily activities, they are self-limiting and don’t require medical treatment in the vast majority of cases.
Guillain-Barré Syndrome Risk
In 2024, the FDA added a warning to the Shingrix prescribing information about a small increased risk of Guillain-Barré syndrome (GBS), a rare condition where the immune system attacks nerve cells, causing weakness and sometimes temporary paralysis. The estimated risk is about 3 extra cases of GBS per million doses given to adults 65 and older, occurring within 42 days of vaccination.
When broken down by dose, the risk appears concentrated after the first shot, with roughly 6 extra cases per million first doses. No increased risk was seen after the second dose. To put this in perspective, shingles itself carries health risks that are far more common and can include lasting nerve pain, vision loss, and hospitalization. For the overwhelming majority of eligible adults, the benefit of vaccination outweighs this very small risk.
Who Should Not Get Shingrix
Shingrix should not be given to anyone who has had a severe allergic reaction (anaphylaxis) to any component of the vaccine. If you’re currently experiencing an active shingles outbreak, vaccination should wait until the rash has healed and symptoms have cleared. People with a moderate or severe acute illness are also generally advised to postpone their shot until they’ve recovered.
Shingrix is approved for immunocompromised adults aged 19 and older, including those who have undergone stem cell transplants or who take immunosuppressive medications. Side effect profiles in these groups are similar to the general population. In clinical trials of stem cell transplant recipients, injection site pain was reported by 83 to 88% of participants, with redness and swelling rates slightly lower than in the general adult population.