Botox vs Filler: What Is the Difference, What Each One Treats and How Long Each Lasts

What is the difference between Botox and filler

Botox is a drug that blocks the signal from nerve to muscle so the muscle moves less, while filler is a medical device implanted under the skin to make it smoother or fuller [1][2]. The table below sums up the main differences from the Botox label and the US FDA's information page.

The Botox label says the drug inhibits the release of acetylcholine at the nerve ending, so the injected muscle works partly less [1]. It adds that the muscle may be reinnervated, which slowly reverses the effect [1]. For frown lines, the label says the effect starts about 1 to 2 days after injection and builds during the first week [1].

The US FDA describes dermal fillers as implanted medical devices approved to give a smoother or fuller look to the face, such as nasolabial folds, cheeks, chin, lips and the back of the hands, and says some fillers are absorbed by the body over time [2]. In Thailand the Thai FDA classes fillers as medical devices that makers, importers and sellers must have licensed before sale [5].

On the Botox side, the Thai FDA's 2024 counterfeit Botox release gives making counterfeit drugs under the drug law as the initial charge, and says no drug registration number was found on the products sold online [6]. So legally the two are handled differently.

Which lines are treated with Botox and which with filler

The Botox label lists only lines tied to muscle activity, while the filler uses the US FDA approves are for folds and lines in the skin and for added volume in certain areas [1][2]. An international expert group explains that filler addresses folds and contours, while Botox addresses lines caused by overactive muscles [3].

The Botox label names frown lines between the eyebrows, crow's feet, forehead lines and platysma bands in the neck, each tied to the activity of a particular muscle [1]. For absorbable fillers the FDA says approval is for adults aged 22 and over, for moderate to severe wrinkles and folds such as nasolabial folds and lines around the mouth, and for adding volume to lips, cheeks, chin and the back of the hand [2].

One point stands out: between the brows and the forehead are sites named on the Botox label [1], but the FDA says injecting filler into the glabella, nose, periorbital area, forehead or neck is not an approved use [2]. That is US information; check the status of each product in Thailand with the Thai FDA. Filler around the eyes is covered in [[under-eye-filler-questions]].

One person's concern can have several causes at once. The expert group has the doctor assess tissue quality, the pattern of volume loss and the pattern of muscle contraction before choosing a method [3]. For forehead and crow's feet lines see [[botox-wrinkle-areas]]; for nasolabial folds see [[nasolabial-cheek-filler]].

How long do Botox and filler last

The Botox label says the effect on frown lines lasts about 3-4 months, while filler has no standard figure because the US FDA says it depends on the filler and the injection site [1][2]. The two figures were measured differently and at different sites, so you cannot say outright which lasts longer.

The Botox label used for this article gives a duration figure only for frown lines; for other areas it gives no standard figure [1].

The FDA says some fillers are absorbed by the body over time, so a repeat procedure may be needed to keep the effect, and each filler has its own use and expected duration, so read the label of the one used [2].

One example is a study of one brand of hyaluronic acid filler in the cheeks (designed and funded by the maker): participants themselves rated their cheek volume as improved in 92.8% at 6 months and 79.0% at 2 years [4]. That is one brand at one site, not a typical figure for all fillers. For how long filler lasts, read [[filler-aftercare-lumps-duration]]; for how soon Botox shows, read [[botox-how-long-to-work-and-last]].

Are the risks of Botox and filler different

Both have serious risks worth knowing, but of different kinds: Botox carries a boxed warning about effects spreading beyond the injection site, causing swallowing and breathing difficulty, while filler carries the risk of unintended injection into a blood vessel [1][2]. There is no standard figure for which is more frequent.

The boxed warning on the Botox label says the effects of the drug may spread from the injection site, that swallowing and breathing difficulties can be life threatening, and that deaths have been reported, with symptoms reported from hours to weeks after injection [1]. The label also lists steps to reduce eyelid drooping, such as avoiding injection near the muscle that lifts the lid [1].

For filler, the FDA says the most concerning risk is unintentional injection into a blood vessel; the chance is low, but the result can be serious and permanent: tissue death, vision abnormalities including blindness, and stroke [2]. More common effects are bruising, redness, swelling, pain, tenderness, itching and rash [2]. The Thai FDA adds that lumps may appear at the injection site and the skin may look paler or darker [5].

On correction, an expert group says hyaluronidase is the enzyme doctors use to manage vascular blockage from hyaluronic acid filler, and advises clinics to have an emergency plan and the agents on hand [7]. The FDA warns, however, that removing or reducing filler may be difficult or impossible, especially permanent fillers or those not made of hyaluronic acid [2].

If you have trouble swallowing, speaking or breathing after Botox, the label says to get medical care at once [1]. If, after filler, you have unusual pain, vision changes, skin that looks white, gray or blue, or stroke-like signs, the FDA says to get medical attention at once [2].

Can Botox and filler be done together

An international expert group says combined treatment with hyaluronic acid filler and Botox is increasingly used and is now a standard of care, planned individually for each patient [3]. That consensus meeting was supported by one manufacturer [3].

The same group says combined use has grown in the lower face, upper face and some midface regions, and suggests modulating muscles to work less rather than leaving them unable to move, in areas where volume loss affects muscle activity [3].

Some panelists were concerned that overtreatment with toxin, especially when retreated quickly, could cause muscle wasting and make volume loss worse [3].

The sources used in this article do not set an order or spacing that applies to everyone. That is a decision for the doctor who assesses your face. For Botox aftercare read [[botox-aftercare-dos-donts]], for filler aftercare read [[filler-aftercare-lumps-duration]], and for the full filler overview see [[what-is-filler]].

What should you check before Botox or filler

The Thai FDA advises choosing a licensed facility with a doctor and asking to see that the product is authorised by the Thai FDA before injection [5][6]. For filler, it advises choosing a clinic with a dermatology specialist on site, checking the registration number on the label, and photographing the product as a record before the procedure [5].

The Thai FDA's 2024 counterfeit Botox case says the production sites searched were unlicensed and unhygienic, and warns that injecting illicit products can be fatal [6]. The US FDA likewise says do not inject filler yourself, see a licensed and experienced provider, and do not buy filler online because it may be counterfeit [2].

The Botox label says the potency measure of that product is specific to its own assay, so it cannot be compared or converted across products [1]. For names and brands of Botox, read [[botox-botulinum-names]].

This article is general information, not treatment advice. Whether to use Botox, filler or both, and where and how much, is for a licensed doctor to decide after examining your face.