You're deciding whether to let someone inject a neurotoxin into your face, and "everyone does it" isn't a safety argument. Here's the actual evidence: what decades of data show, what the real side effects are, and who genuinely shouldn't be treated. No minimizing, because informed patients are the ones who do well.
What does the safety record actually look like?
Botulinum toxin type A has been used medically since the 1980s and cosmetically under FDA approval since 2002: millions of treatments a year, tracked through one of the longest safety records in aesthetic medicine. At cosmetic doses, serious adverse events are rare, and the overwhelming majority of reported side effects are temporary and local. The doses involved are also a fraction of the medical doses used for conditions like chronic migraine, themselves used safely for decades.
What are the common side effects?
The common ones: pinpoint redness and bruising at injection sites, a mild headache for a day or so in some patients, and occasionally a heavy feeling as the product settles. All temporary. The most common aesthetic side effect is a result you don't love (too much smoothing, too little, an uneven brow), which fades on the same three-to-four-month clock as everything else this product does.
What are the rare risks?
The one worth knowing by name is ptosis: a temporary drooping of an eyelid or brow when product migrates to a muscle it wasn't meant for. It occurs in a small percentage of treatments, is more common with inexperienced injection technique, and resolves as the product wears off. Genuine systemic reactions at cosmetic doses are rarer still. For completeness: botulinum toxin products carry an FDA boxed warning about the rare spread of toxin effects away from the injection site, reported almost entirely in medical uses at far higher doses than cosmetic treatment, and part of why dosing discipline and history review matter. This risk profile is why injector skill and anatomy knowledge matter more than any other factor you can control.
Who should not get Botox?
Straightforward exclusions: pregnancy and breastfeeding (not because harm is proven, but because it can't ethically be studied, so the answer is wait), certain neuromuscular conditions like myasthenia gravis, known allergy to a formulation's components, and an active infection at the injection site. This is exactly what the intake history screens for. It's the unglamorous step that keeps the safety record boring.
Safety questions are consultation questions. Bring all of them. Complimentary, no obligation, and the medical history review comes first.
How do you choose a safe injector?
Concrete things to look for, anywhere you go: treatment in a medical practice with physician oversight, an injector who takes a real medical history before quoting a dose, product sourced from the manufacturer (ask: good practices answer happily), and a plan for follow-up if something needs adjusting. Deals that skip the history, quote sight-unseen, or can't name their physician are where the rare risks stop being rare.
Want independent reading? MedlinePlus's Botox overview (the National Library of Medicine's plain-language reference) is where we point patients who'd rather not take a med spa's word for any of this.