Composition comprising self-assembling peptidomimetic compounds, comprising alternate hydrophobic and hydrophilic residues, in which the hydrophilic residues alternate between positively charged and negatively charged residues, in which the self-assembling peptidomimetic compounds are selected from the group consisting of oligoureas with N, N ', oligopyrrolinones, oxazolidin-2-ones, azathides, azapeptides, β-peptides, γ-peptides, δ-peptides and copolymers of α-peptides, β-peptides, γ-peptides and δ-peptides, in the that the peptides have a length within the range of 6-64 amino acid residues for use in a method to inhibit the movement of a body fluid and / or contaminant on or in an animal when administered to a site that needs it, in that the self-assembling peptidomimetic compounds are capable, after interaction with at least one ionic species present in or on an animal, of forming a structure that inhibits the movement of a body fluid and / or contaminant on or in the animal.
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