If you are a family member or friend of someone who suffers from depression (in any of its types or forms), there are things that you can do to help that person.
1. Be upbeat, but sensitive
A fine line here. The "upbeat" thing combined w/ sensitivity may sound difficult to pull off, but I have observed and even been with people who can go there. If, to you, being upbeat means that you're in a boastful, let-me-tell-you-how-great-my-life-is-right-now mood (that's not it). Upbeat is a positive, encouraging, uplifting, "everything's going to get much better" frame of mind. Not that you say any of those phrases or words aloud, but that you exude that kind of energy.
2. Show compassion
You can ask yourself if you truly care about this depressed person, and then show that level of caring in your facial expressions, body language, words, tone, and actions. Yeah, I know - sounds "un-doable" & ridiculous (?) None of us are perfect supporters of sick, hurting, or depressed individuals. We can just decide to put forth our best efforts, ...and then go. Make mistakes - it's ok. None of us are are without fumbles. We learn as we go.
3. (to emphasize one of orange popsicle's points, previously posted)...Wear something "well-put-together" - it doesn't have to necessarily be specifically "happy", "colorful", "cheerful". Just something that you've put together that suits you, your day, the weather, the season, the occasion, whatever. For some reason, it's quite uplifting to see someone in your life (at home, office, out shopping, having lunch, wherever) who is going about normal life & getting ready for their day in the usual way, in their own unique style. Hard to explain, but it's true for many.
4. Be an attentive listener, but don't force conversation. Maybe just make "small talk" if you want. Sometimes gentle distractions are a bit of a relief.
5. Please don't say things like "cheer up", "snap out of this mood", or "you're not helping yourself - get over it". Do I need to explain this.
Comforting a depressed person in your life comes out of a very unselfish, "un-self-serving" place. In my opinion, could be one of the best meds. No prescription necessary.