Eisai to Launch “Pariet S,” the First Proton Pump Inhibitor RX-to-OTC in Japan
TOKYO, June 2, 2025 – (JCN Newswire via SeaPRwire.com) – Eisai Co., Ltd. announced today the launch of “Pariet®S” (pharmaceutical requiring guidance), which is highly effective in alleviating severe heartburn andstomach pain caused by gastric acid reflux, at pharmacies and drugstores throughout Japan.(1)”Pariet S” is the first proton pump inhibitor (PPI(2)) to receive manufacturing and marketing approval as an over the counter (OTC) medicine in Japan. Rabeprazole sodium, in an amount equivalent to that used in the prescription product(3), works directly on the proton pumps that produce stomach acid, effectively alleviating severe heartburn caused by gastric acid reflux and stomach pain due to excessiveacid secretion. The medicine comes in small, easy-to-swallow tablets, with a once-daily dosage providing 24-hour relief.Rabeprazole sodium, the active ingredient in “Pariet S”, is a PPI developed at Eisai’s Tsukuba Research Laboratories. The medicine was first launched in Japan in 1997 as a prescription pharmace…