Usually only 1 - and the times when you would need 2, the second syringe would likely be a different formulation, or brand, of filler
Clinical research suggested doses in the range of 1-10mcg per kilogram of body weight showed efficacy, though most protocols standardized around 4-6mcg/kg for practical application
Botox is often injected to remedy a number of bladder disorders, including overactive and leaking bladder, as well as a variety of eye disorders, including uncontrolled blinking and crossed eyes
PMID: 16032049
No claims are made regarding biological activity, safety, efficacy, or medical benefit
Furthermore, researchers note that Retatrutides tolerability pattern closely resembles other incretin-based peptide agonists