Cosmetic injections used today are very safe. Depending on what is being injected will dictate the possible side effects. For a full list and to determine if you have specific side effect possibilities because of other medical conditions, an evaluation by a trained physician is necessary.
When getting FDA approval for a medication, companies must perform studies to determine possible side effects. These side effects are usually published on the company's web site for consumers to view. Before having a cosmetic injection, it is a good idea to research the possible side effects for the individual medication being considered before visiting with a physician.
As a general idea, there are two types of injectibles in use today: Botox Cosmetic(R) and fillers (these include Juvederm, Restylane, Perlane, and Radiesse just to name a few).
Botox Cosmetic lists the most frequently reported adverse events as headache, respiratory infection, flu syndrome, blepharoptosis (droopy eyelid), and nausea when used for lines between the brows, currently the only FDA indication for Botox Cosmetic.
Though each filler has different side effects, common side effects for all fillers include erythema (redness), swelling, pain, itching, bruising and tenderness at the implant site. It is important to speak with an experienced physician and disclose any medical conditions before undergoing cosmetic injections as some medical conditions are contraindications to injections.