Alarm clock - various repeat intervals

Can anyone suggest an alarm clock that you can repeat at any increment you want? I've looked on the Market and other forums and everyone pretty much says to just create multiple alarms. Most alarms I've found can repeat at a day interval. I found one that even can do at an hour but that's still not what I want.

Sometimes my kids have medicine that they need at regular intervals; just odd ones. Doing potty training and want to set an alarm to go off every 25 minutes but I don't want to create 16 different alarms. That sort of thing. I've even looked at pill reminder apps but on the ones I've seen you still have to set each alarm individually. It seems like a relatively simple thing so I'm surprised that I have had difficulty finding one.