The pneumonia vaccine 23 (PPSV23, sold as Pneumovax 23) causes mild, short-lived side effects in most people. Injection-site soreness is the most common reaction, affecting about 60% of recipients, and nearly all side effects clear up within one to two days. Serious reactions are extremely rare.
Common Side Effects
The most frequently reported reaction is pain or tenderness at the injection site. In clinical data, about 60% of people who received PPSV23 experienced soreness where the needle went in. Swelling or hardness at the site occurs in roughly 20% of recipients, and redness appears in about 16%.
Beyond the injection site, you may notice whole-body symptoms that feel similar to a mild flu. These include fatigue or drowsiness, headache, low-grade fever, muscle aches, joint pain, chills, and a temporary dip in appetite. Some people also find it harder to move the arm that received the shot for a day or so. Large studies comparing PPSV23 with another pneumococcal vaccine in adults over 50 found that both vaccines produced this same general profile of reactions.
How Long Side Effects Last
Most side effects appear within the first few hours after vaccination and resolve within one to two days. Injection-site soreness sometimes lingers slightly longer, but it generally fades on its own without any treatment. If symptoms like fever or body aches persist beyond 48 hours or get noticeably worse rather than better, that warrants a call to your doctor since it could signal something unrelated to the vaccine.
Managing Discomfort After the Shot
A cool compress on the injection site can help reduce swelling and soreness. Over-the-counter pain relievers like ibuprofen or acetaminophen are effective for headache, muscle aches, or fever. Gently moving the arm throughout the day, rather than keeping it still, often helps soreness resolve faster. Staying hydrated and getting extra rest can also take the edge off fatigue and that general “off” feeling.
Rare but Serious Reactions
Severe allergic reactions (anaphylaxis) to PPSV23 are possible but exceedingly rare. Signs of a serious allergic reaction include difficulty breathing, swelling of the face or throat, rapid heartbeat, dizziness, and hives. These symptoms typically appear within minutes of the injection, which is why vaccination sites ask you to wait for a short observation period afterward.
People with severely compromised heart or lung function face a slightly higher risk from any systemic reaction, including fever or inflammation, because their body has less reserve to handle even a mild immune response. If you have advanced heart or lung disease, your provider may weigh that risk before administering the vaccine. PPSV23 is contraindicated for anyone who has had a severe allergic reaction to any component of the vaccine.
Second Doses and Stronger Reactions
Some people receive PPSV23 more than once, particularly those who were vaccinated before age 65 and need a second dose later. Revaccination tends to produce slightly more noticeable injection-site reactions compared to the first dose. The side effects are still self-limiting, but you may experience more pronounced redness and swelling the second time around.
How PPSV23 Fits Into Current Recommendations
PPSV23 protects against 23 types of pneumococcal bacteria, but it is no longer the first-choice pneumococcal vaccine for most adults. Current CDC guidelines recommend that adults 50 and older receive one of the newer conjugate vaccines (PCV15, PCV20, or PCV21) as the primary shot. If you receive PCV15, a dose of PPSV23 is still recommended about a year later to broaden your coverage. If you receive PCV20 or PCV21, no additional PPSV23 dose is needed because those vaccines already cover enough bacterial types on their own.
If you already received PPSV23 in the past, you do not need a repeat dose. Your provider may recommend a newer conjugate vaccine to complement the protection you already have, depending on your age and health conditions.