Tip: double - pumping increases prolactin levels even more, so we encourage you to pump both sides at the same time. (pumpables.co)
Most medications that act as galactagogues work by increasing prolactin levels. (breastfeeding.asn.au)
Most of the medications that can help milk supply work by indirectly increasing prolactin levels in the body (a hormone important in producing breast milk) for example, domperidone, metoclopramide, and sulpiride. (breastfeedingtoday-llli.org)