What Are the Side Effects of Botox?

The most common side effects of cosmetic Botox are mild and temporary: bruising, swelling or tenderness where the needle went in, a headache, and, less often, a drooping eyelid or brow. In the FDA-approved label, eyelid ptosis (a droopy upper eyelid) occurred in about 3% of people who had frown-line injections, and headache in about 9% of people who had forehead-line injections (AbbVie, 2024). Serious problems such as trouble swallowing or breathing are rare at cosmetic doses, and recent severe cases have been linked mostly to counterfeit products or self-injection (Lamere et al., 2025; Thomas et al., 2024).

What This Means

Botox Cosmetic (onabotulinumtoxinA) is a purified botulinum toxin that temporarily relaxes the specific muscles it is injected into. The FDA has approved it for adults to temporarily improve the appearance of moderate to severe frown lines, crow's feet, forehead lines and, since 2024, vertical neck bands called platysma bands (AbbVie, 2024). Most side effects come from two sources: the needle itself, and the toxin reaching a nearby muscle it was not meant to relax (American Academy of Dermatology [AAD], n.d.; Witmanowski & Błochowiak, 2020).

Side effects fall into three rough groups. Common and short-lived: pain, redness, swelling and bruising at the injection sites, with bruising usually fading in about a week (AAD, n.d.). Uncommon and self-limited: headache, a heavy or droopy brow, eyelid ptosis, eyelid swelling, or a slightly uneven smile after lower-face injections (AbbVie, 2024; Cavallini et al., 2014). Rare and serious: spread of the toxin effect away from the injection site, which the label carries as a boxed warning and which can cause swallowing, speech or breathing difficulty (AbbVie, 2024).

Candidacy

Botox Cosmetic is not appropriate for everyone. The label lists two contraindications: a known allergy to any botulinum toxin product or its ingredients, and an infection at the planned injection site (AbbVie, 2024). It also calls for extra caution in people with a neuromuscular disorder such as myasthenia gravis or Lambert-Eaton syndrome, pre-existing heart disease, reduced breathing function or swallowing problems, and anyone taking aminoglycoside antibiotics or other drugs that affect nerve-to-muscle signaling, because these can strengthen the toxin's effect (AbbVie, 2024). A droopy eyelid or brow before any injection is also worth noting, since it changes how the upper face should be approached. Pregnancy and breastfeeding are discussed at the visit, and in most cases cosmetic injections are deferred.

Clinical Evaluation

At PrimeCell Regenerative, Dr. Chantasi reviews medical history, current medications and supplements, prior neurotoxin sessions (product, dose and date), and any side effects from those sessions before recommending a plan. The exam looks at how each muscle moves at rest and in expression, brow and eyelid position, and facial symmetry. Dose and placement are chosen for the individual face, within the label's recommended dosing for each area. Candidacy is decided by the physician after that evaluation, not before it.

Available Options

Botox is one of several FDA-approved botulinum toxin products; Dysport, Xeomin, Jeuveau and Daxxify are others, each with its own approved uses and dosing. Their units are not interchangeable, so a dose of one cannot be converted into a dose of another (AbbVie, 2024). For people who would rather avoid a neurotoxin, other routes to discuss include daily sunscreen and prescription topical retinoids, hyaluronic-acid fillers, collagen stimulators such as Sculptra or Radiesse, and resurfacing procedures. Choosing no injection at all is also a reasonable option.

Benefits, Limitations and Risks

The benefit is a temporary softening of lines caused by muscle movement. Effects usually last about three to four months (AAD, n.d.). Results vary, and Botox does little for lines that are etched into the skin at rest or for volume loss.

The risks are real even when the product is genuine and the injector is trained. A meta-analysis of 24 studies of frown-line and forehead injections found an overall complication rate of about 16%, mostly headache, local skin reactions and temporary muscle-related effects (Zargaran et al., 2022). A separate systematic review of 35 studies and more than 8,700 people reported eyelid drooping in about 2.5%, brow drooping in about 3.1%, and lip asymmetry in about 6.9% of lower-face cases, all of which resolved on their own (Cavallini et al., 2014). Rarely, people form antibodies to the toxin; in the label's pooled data, 1.5% developed binding antibodies and none developed neutralizing antibodies (AbbVie, 2024). The label also reports cardiovascular adverse events after botulinum toxin products, some fatal, in people with existing heart disease (AbbVie, 2024).

The most serious recent cases involved products bought outside legitimate channels. In 2024, seven women in Tennessee and New York City became ill after injections in nonmedical settings, four were hospitalized, and at least four had received counterfeit product (Thomas et al., 2024). In 2025, three women who self-injected botulinum toxin bought online were hospitalized, and one needed a ventilator (Lamere et al., 2025).

What the Evidence Shows

The evidence does establish that, at labeled cosmetic doses given by trained clinicians, most side effects are mild, local and temporary (Cavallini et al., 2014; Zargaran et al., 2022). The label states that no definitive serious adverse event reports of distant toxin spread have been tied to cosmetic use at labeled doses (AbbVie, 2024). The evidence also establishes that counterfeit products, unlicensed injectors and self-injection carry a clearly higher risk of severe illness (Lamere et al., 2025; Thomas et al., 2024).

The evidence does not establish long-term safety across decades of repeated sessions with the same precision as short-term safety, and many studies do not report who performed the injections, which makes it hard to compare injector training and complication rates (Zargaran et al., 2022). Reporting of side effects is also inconsistent from study to study, so published rates are estimates rather than exact figures (Zargaran et al., 2022).

Recovery and Next Steps

Most people return to normal activities the same day. For the first few hours, avoid rubbing or massaging the injected areas, apply makeup gently, and wait about two hours before strenuous exercise (AAD, n.d.). Bruising and swelling usually settle within days, and a bruise can take about a week to fade (AAD, n.d.).

A droopy eyelid or brow, if it happens, is temporary and fades as the effect wears off. Symptoms of toxin spread have been reported from hours to weeks after injection (AbbVie, 2024). Seek medical care right away for trouble swallowing, speaking or breathing, new double vision, or generalized muscle weakness, and tell the clinician you had botulinum toxin injections.

Orlando Considerations

Before any injection in Central Florida, confirm who is doing it and what product is used. A Florida medical license can be checked through the Florida Department of Health's online license verification, and genuine Botox Cosmetic comes in a manufacturer-sealed vial that can be shown to you. Federal health officials advise receiving botulinum toxin only from licensed, trained professionals in a medical setting, using FDA-approved product from authorized sources (Lamere et al., 2025).