Pulsatilla Nuttalliana is a homeopathic remedy for diarrhea. Worse coming in from open air; after eating; eating a pear; at night; warmth; reading; urinating; walking. Better walking in open air; rubbing with flesh-brush; scratching. Source: Robin Murphy Lotus Materia Medica
You can find Pulsatilla Nuttalliana Pills at Remedy Source.