There are two known types of atelectasis. The first type is called acute atelectasis which usually results from surgery involving the opening of the chest cavity or the abdominal area. This type of atelectasis may also result from physical trauma to the lungs like during car accidents or stabbing incidents.
Location: Egypt. Posts: 1,672. Re: How long for meds to take effect. It takes from 1 to 2 days in order for your high bp meds to work, but it reach its maximum effect in 1 week and some times it takes 2 weeks. They said that but I think it's only a week, not more than that.
Rating Newest Oldest. Best Answer: Oral meds take longer than 15 minutes to start working (or rather, to FEEL them start working). More like at least a half hour, up to an hour, depending on your digestive system, what's in your stomach, etc. Onset is 20 minutes, peak is 30-60 minutes.Source(s): RN; Lippincott's Nursing Drug Guide.t takes longer if they have worn off to take effect. Usually about 30 mins or longer if the pain is severe. But once it kicks in be sure not to miss the next dose.