Extra strong, yet gentle, Senokot Extra Strength Tablets provide relief of constipation For comfortable overnight relief of occasional constipation through with natural senna. Senokot Extra Strength Tablets only use natural senna because when it comes to managing or gently relieving constipation, the senna plant has over a thousand years of experience. The senna used in Senokot® is the deseeded and dried pods of the Cassia Acutifolia Delile otherwise known as the Alexandrian senna.