The drug combination clindamycin/tretinoin (trade name Ziana and Veltin) is a topical acne

Acne

Acne is a general term used for acneiform eruptions. It is usually used as a synonym for acne vulgaris, but may also refer to:*Acne aestivalis*Acne conglobata*Acne cosmetica*Acne fulminans*Acne keloidalis nuchae*Acne mechanica...

 treatment. It combines clindamycin phosphate (1.2%), an antibiotic, and tretinoin

Tretinoin

Tretinoin is the acid form of vitamin A and is also known as all-trans retinoic acid or ATRA. It is a drug commonly used to treat acne vulgaris and keratosis pilaris. It is available as a cream or gel...

 (0.025%), a retinoid

Retinoid

The retinoids are a class of chemical compounds that are related chemically to vitamin A. Retinoids are used in medicine, primarily due to the way they regulate epithelial cell growth....

. There is a generic form. It comes in 2, 30, and 60 gram tubes and should be stored at 77 degrees F, with the tube tightly shut away from light. Side effects may include peeling, redness, dryness, itching and photosensitivity. Also, topical clindamycin may rarely cause diarrhea or colitis

Colitis

In medicine, colitis refers to an inflammation of the colon and is often used to describe an inflammation of the large intestine .Colitides may be acute and self-limited or chronic, i.e...

.