Objective To explore the way of clinical pharmacists participating in formulating the chemotherapy regimen for cancer and pharmaceutical monitoring, through the practice of drug treatment in a patient with gestational trophoblastic neoplasia. Methods Clinical pharmacists participated in the treatment of one patient with low-risk gestational trophoblastic neoplasia in gynecological chemotherapy ward, from the first chemotherapy in January 2015 to the clinical cure. The countermeasures included designating chemotherapy regimen, monitoring clinical efficacy and adverse reactions, changing the chemotherapy regimen in time when the curative effect was poor, and coping with adverse reactions. Results Physicians adopted the suggestions from clinical pharmacists and the patient was clinically cured after standardized treatment. Conclusion Pharmaceutical care by clinical pharmacists can assist clinicians to ensure the safety and effectiveness of drug use.