What is the best medicine for IBS diarrhea?

Generally speaking, probiotics such as Bacillus acidophilus, Bifidobacterium bifidum, Lactobacillus acidophilus and Bacillus casei can be taken orally to relieve diarrhoea symptoms by regulating intestinal flora imbalance; intestinal calcium channel blockers such as pivetonium bromide can also be chosen to relieve diarrhoea symptoms by regulating intestinal functions; adsorbent anti-diarrhoea drugs such as Simethicone and medicinal charcoal can also be used; if diarrhoea is severe, loperamide or compound difenoxil can be chosen for anti-diarrhoea treatment, but should not be used for a long time.