Pharmaceutical preparations, including synthetic peptide solutions, for example, self-assembling peptide formulations, said solutions capable of forming hydrogels used for medical purposes, for example, as a hemostatic agent, for example, in surgical procedures, including endoscopic surgeries; medical preparations of the aforementioned peptide solutions used as for achieving hemostasis, for example, for bleeding from small blood vessels encountered during, for example, intracranial and spinal procedure or surgeries, partial hepatectomy, splenectomy, nephrectomy, pancreatectomy, prostatectomy, ear/nose/throat (ENT) procedures, myomectomy, surgery of the aorta or any peripheral arteries, coronary bypass, femoral bypass, surgeries and procedures in ear, nose and throat or in gastrointestinal tract (GI) or surrounding tissues, performed, for example, for non-variceal GI bleeding from peptic ulcer, malignant tumour, or mucosal resection site in endoscopic mucosal resection (EMR) or endoscopic submucosal dissection (ESD), and laparoscopic resection of GI tract organs; syringes pre-filled with the aforementioned synthetic peptide solutions.