Sostanze sia di estrazione vegetale che di sintesi chimica, classificabili in base al loro meccanismo d’azione o in base alle caratteristiche chimico-fisiche delle molecole costitutive e della nota o presunta azione farmacologica, capaci di stimolare lo svuotamento del colon-retto. Vedi Alvo, Stipsi.

Tab. 4: Classificazione sinottica dei lassativi per metodo di azione

Aumentano il volume del residuo solido non assorbibile
Metilcellulosa; sterculia; agar; crusca; isphagula; psyllium, PHGG

Aumentano il contenuto di acqua nell’intestino
Carboidrati non assorbibili (lattulosio, sorbitolo, mannitolo)

Aumentano il contenuto di acqua nelle feci
Purganti salini (fosfato di sodio, solfato di magnesio, idrossido di magnesio);

Modificano la consistenza delle feci
Docusato di sodio Olio di ricino Glicerina

Aumentano la motilità e la secrezione intestinale
Derivati del difenilmetano (Fenolftalenia, Bisacodile);
Derivati dell’Antrachinone (Senna, Cascara)

Tab. 5: LASSATIVI: dosaggi consigliati (esclusi emollienti) *

NOME: Crusca
Psyllium (Psyllogel, Planten,
Psylloplus, Plantalax, ..)
DOSAGGIO: 2 buste al dì
NOME: Ispagula (Fibrolax)
DOSAGGIO: 3 bustine al dì
NOME: PHGG (Benefibra)
DOSAGGIO: 1 busta al dì (5 gr)

NOME: Polietilenglicole (Selg, Isocolan,
Movicol, ..)
DOSAGGIO: 17 gr/die
NOME: Lattulosio (Laevolac)
DOSAGGIO: 30 ml/die
NOME: Lattitolo (Portolac)
DOSAGGIO: 20 gr/die

NOME: Solfato di magnesio
DOSAGGIO: 15 gr/die
NOME: Citrato di magnesio
DOSAGGIO: 200 ml/die

NOME: Senna (Pursennid)
DOSAGGIO: 4 cpr/die
NOME: Bisacodile (Verecolene, Alaxa)
DOSAGGIO: 10 gr/die

* La tab. è fortemente incompleta, appena sufficiente a dare l’idea della difficoltà a bene
utilizzare i prodotti commerciali. I nomi tra parentesi sono commercialmente registrati.

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