Tags: Drug.
The drug combination erythromycin/tretinoin (trade name Isotrexin) is a topical gel with active ingredients erythromycin 2% w/w and tretinoin 0.05% w/w for the treatment of acne.Tretinoin is a type of vitamin A. It reduces the production of sebum. (Sebum is a sticky oil-like substance which is produced from the sebaceous gland.)Erythromycin is an antibiotic.Acne is caused by blockage of the pores.