While theres not much information to say that collagen interacts with other prescription medications, there may be other ingredients in dietary supplements, such as herbal extracts, that may interact with commonly prescribed medications
Millar FR, Pennycuick A, Muir M, Quintanilla A, Hari P, Freyer E, Gautier P, Meynert A, Grimes G, Coll CS, et al
Taboada M, Cariena A, Moreno E, Rodrguez N, Domnguez MJ, Casal A, et al
Ive been using glutathione injections for about 6 months

Ingredient information each-capsule: 58.3% (estimate) contains: 20.8% (estimate) acetyl-l-carnitine: 10.4% (estimate) n-acetyl-l-carnitine-hydrochloride: 10.4% (estimate) non-medicinal-ingredients: 10.4% (estimate) capsule: 10.4% (estimate) carbohydrate-gum: 5.2% (estimate) E460: 5.2% (estimate) filtered water: 5.2% (estimate) E460i: 5.2% (estimate) vegetable-grade-magnesium-stearate: 2.6% (estimate) lubricant: 2.6% (estimate) E551: 2.6% (estimate) Food processing Ultra-processed foods 1 ultra-processing marker Limit ultra-processed foods Limiting ultra-processed foods reduces the risk of noncommunicable chronic diseases Elements that indicate the product is in the 4 - Ultra processed food and drink products group: Additive: E460 - Cellulose Food products are classified into 4 groups according to their degree of processing: Unprocessed or minimally processed foods Processed culinary ingredients Processed foods Ultra-processed foods The determination of the group is based on the category of the product and on the ingredients it contains
