Docusate Sodium USP. Gentle relief. No. 1 doctor recommended brand (Among stool softener ingredients). Trusted for guaranteed relief. Dulcolax Stool Softener contains the no. 1 doctor recommended stool softening ingredient. It works gently by drawing water into the stool in order to prevent dry hard stools and make passage more comfortable. Many people find two liquid gels an effective starting dosage and then one liquid gel for maintenance. Each Liquid Gel Contains: Sodium 5 mg.