A cannula (1) for dispensing fluid products, particularly for vaginal and rectal applications, comprises: a tubular body (2) for containing a fluid product (P), having a first extremity (2a), at which a dispenser opening (3) is formed, and a second open extremity (2b), opposed to the first extremity (2a). A cover cap (4) is fitted onto the tubular body (2) to close the dispenser opening (3). A closing body (5) associated with the tubular body (2) closes the second extremity (2b). The closing body comprises a first element (6) and a second element (7) made in a single body piece and joined along tearable connection means (8, 9, 10). The second element (7) removable by tearing off the first element (6) to act as a anti-tampering seal. The first element (6) is a cylinder partially insertable through the second extremity (2b) to function as a sliding piston inside the tubular body (2) once the second element (7) has been torn off. The cover cap is converted to a push rod for moving the piston by removing longitudinal sections of the cover cap, and then folding over the remaining sections to reduce the cross-section of the push rod.膣および直腸に特に適用される流動製品投薬用カニューレ（１）は、投薬口（３）が設けられた第１端部（２ａ）と第１端部（２ａ）に対向する第２開口端部（２ｂ）とを有し流動製品（Ｐ）を収容する管状体（２）と、前記管状体（２）に嵌め込まれて前記投薬口（３）を閉じるカバーキャップ（４）と、前記管状体（２）に結合して前記第２端部（２ｂ）を閉じると共に、単一体で作られ引きちぎり可能接続手段（８，９，１０）に沿って結合した第１要素（６）および少なくとも第２要素（７）を有する閉鎖体（５）とを備え、前記第２要素（７）は前記第１要素（６）を引きちぎることによって離脱可能で封印手段として働き、前記第１要素（６）は前記第２端部（２ｂ）を介して少なくとも一部が挿入可能であり、前記第２要素（７）が引きちぎられたとき前記管状体（２）の内部の摺動ピストンとして働くのに適している。
