Are sulfacetamide sodium or monodox (doxycycline monohydrate) effective in treating acne scars?

No. They are useful for treating acne, and treating it can prevent more scars. But these medicines won't actually do anything for existing scars.
Not for scars. This is not so much for treating scars as it for preventing scars by minimizing bacterial counts and the damage that is done by the bacteria and your bodies response tothe bacteria.

Related Questions

Whats the best way to get rid of acne, I've tried benzoyl peroxide, and monodox, (doxycycline monohydrate) and every OTC thing I can find?

Retin-A cream. A possible next step is to try a prescription cream called retin-a. It is a form of vitamin a and promotes skin turnover (less dead skin for bacteria to become trapped). A side effect is minor irritation at the beginning of use and increased sensitivity to sunlight. Read more...
Improve not remove. The best treatment is Accutane but most start with antibiotics & skin care regimen with benzoyl peroxide/salicylic. Acid many options exist for cosmetic improvement and include anti-inflammatories, peels, exfoliation, lasers, resurfacing, bleaching, excision, grafting, fillers, and much more, scars vary in their severity and so do the treatments. See plastic surgeon/dermatologist/ent for options. Read more...
It's time for... A consultation with a good dermatologist, since you've tried all the basic steps. You will likely need prescription-level products. Read more...

I have worsening cystic acne on chin. Itchy and dry. Afew have been around for weeks. On monodox (doxycycline monohydrate). I have get 3-5 pimples on cheeks once a month. Help.?

Cystic Acne. Isotretinoin is commonly prescribed for cystic acne available under brand names such as absorica, amnesteem, claravis and sotret. This medication reduces the size of oil glands so that less oil is produced and bacterial growth is inhibited. This is the most effective acne medication. Read more...
Treatable. Hi, Oral antibiotics for acne are hit or miss. Please try to prevent any emotional trauma if these pills don't bring you all the way to total satisfaction. I made a video that may help prevent the emotional impact of this common approach: https://www.youtube.com/watch?v=vYW3I6giJEg hope it helps, have a great day, -Dr. Neal Schwartz. Read more...