Exparel Side Effects: What to Expect and When to Call Your Doctor

Exparel (bupivacaine liposome injectable suspension) is a non-opioid injectable anesthetic administered in the surgical setting to provide postoperative pain relief for up to 72 hours. Like all medications, it carries a profile of potential side effects — ranging from common and mild to rare and serious.

Understanding what's normal after an Exparel injection — and what isn't — can help you recover confidently and know when to contact your medical team. Here's what the clinical evidence says about Exparel's side effect profile.

Common Side Effects After Exparel Wound Infiltration

In clinical trials evaluating Exparel injected directly into the surgical wound (local infiltration), the most commonly reported side effects were:

• Nausea — very common in the postoperative period; may be related to surgery and anesthesia rather than Exparel specifically
• Constipation — common after surgery; may be less pronounced with Exparel due to reduced opioid use
• Vomiting — related to postoperative nausea; usually resolves within 24–48 hours

These side effects are similar to those seen with other local anesthetics used in the postoperative period and often aren't distinguishable from standard surgical side effects.

Common Side Effects After Exparel Nerve Block (Interscalene / Peripheral)

When Exparel is used as a nerve block (injected near a nerve rather than the wound), the common side effects shift slightly:

• Nausea — most frequently reported side effect
• Fever — relatively common; usually mild and transient
• Constipation — common in the postoperative period
• Temporary numbness and weakness — expected with any nerve block; your arm or leg may feel heavy or difficult to move for 24–72 hours

Local Wound-Site Effects

Some patients may notice mild reactions at or near the injection site:

• Erythema (redness) at or near the wound
• Edema (swelling) around the surgical site
• Induration (firmness) near the injection site
• Persistent local numbness — expected and resolves as drug wears off

These are generally expected and similar in frequency to what's seen with standard bupivacaine.

Serious Side Effects: What to Watch For

Although rare, serious adverse events can occur with Exparel and all bupivacaine-based local anesthetics. Know these warning signs:

Local Anesthetic Systemic Toxicity (LAST)

LAST occurs when bupivacaine enters the bloodstream at high concentrations, affecting the brain and heart. Because Exparel releases bupivacaine slowly over up to 96 hours, LAST can be delayed — presenting days after the injection rather than immediately. Symptoms of LAST include:

• Restlessness, anxiety, or confusion
• Lightheadedness, dizziness, or tinnitus (ringing in the ears)
• Numbness or tingling of the mouth and lips
• Blurred vision, tremors, or muscle twitching
• Seizures or loss of consciousness
• Irregular heartbeat, chest pain, or cardiac arrest (in severe cases)

If you experience any of these symptoms within the first 4–5 days after receiving Exparel, call 911 or go to the nearest emergency room immediately.

Methemoglobinemia

In rare cases, Exparel can cause methemoglobinemia — a condition in which hemoglobin can't carry oxygen properly. This risk is higher in elderly patients, those with genetic predispositions, or when combined with other drugs that cause methemoglobinemia (such as certain antibiotics or nitroglycerin). Signs include:

• Pale, gray, or blue-colored skin, lips, or fingernails
• Shortness of breath or confusion — seek emergency care immediately.

Allergic Reactions

True allergic reactions to bupivacaine are rare but possible. Signs include hives, rash, swelling of the face or throat, or difficulty breathing. These require emergency medical attention.

When to Call Your Doctor (Non-Emergency)

Call your surgeon's office (non-emergency) if you experience:

• Pain at the surgical site that seems unusually severe after the expected numbness wears off
• Numbness that persists well beyond 72–96 hours in your extremity after a nerve block
• Signs of wound infection (increasing redness, warmth, drainage, or fever above 101°F/38.3°C)
• Ongoing nausea or vomiting that prevents you from taking oral medications

Finding Your Post-Surgery Prescriptions

If you're managing your post-surgery oral medications and need help finding a pharmacy with them in stock, medfinder is a paid service that calls pharmacies near you to locate your prescriptions, then texts you the results. It covers all medications — so whether you need an anti-nausea medication, an NSAID, or something else prescribed post-surgery, medfinder can help.

Also read: Exparel Drug Interactions: What to Avoid and What to Tell Your Doctor.