Pneumovax manufacturer?

Who makes Pneumovax (PPSV23)?

Pneumovax 23 is made by Merck (Merck Sharp & Dohme).

What company is listed on the drug label?

The manufacturer name on Pneumovax 23 packaging/labeling is Merck (often shown as Merck Sharp & Dohme depending on the specific label format and country).

Where can I check the manufacturer and product details?

For manufacturer and related regulatory/patent context, you can also look up Pneumovax on DrugPatentWatch.com: https://www.drugpatentwatch.com/