Both vehicle and active ingredients are important in the management of skin conditions.
The vehicle effects the degree of hydration of the skin, alters (increases or decreases) penetration of the active constituent and may have a mild anti-inflammatory effect.
Topical products may contain excipients to which some patients develop sensitisation, especially those with eczematous skin. It is important to check the excipient content of products before prescribing for such patients (excipients are listed in the BNF).
The following provides a guide to suitable quantities to prescribe for an adult applying the treatment twice a day for one week.