My cat Karl has been dealing with Chronic Constipation for some time. He has undergone numerous enemas (sometimes up to 3 in one visit!), had x-rays, scopes, etc., and no one has ever been able to tell me what is wrong with him. (They have said they do not believe it to be megacolon.)
At any rate, he was put on Lactulose (the liquid) but he would throw up, so we decided instead to go for the kristalose, which is a powder that can be sprinkled on food. (We add it to a mixture of tuna, tuna water and water, so he not only gets the meds, but also increases what he is drinking.) He is also on Zantac (about 1/3 tablet a day or 2x a day, depending.)
Still, while this regimen seemed to help, he was still having problems. Soon we were having to go to the vet every 2-4 weeks. In this economy, it was becoming a problem and we were not sure how to move forward.
About 3 weeks ago, he started growling/screaming again, letting me know he couldn't go. But I didn't have the money to take him for yet another enema (having just taken him a few weeks before). So we decided to wait it out in hopes he would eventually push it out.
However, he stopped drinking and eating, which became a big concern. I called my vet, and they taught me how to give him sub-cutaneous fluids. To purchase a 1000ml bag of fluids, a line, and 10 needles cost me only $30! We decided to give him fluids regularly in hopes that having extra moisture would help.
I'm happy to say that while we obviously haven't cured the problem, Karl is going potty on his own! And in the cat box too! (he would often go other places, his way of letting me know he didn't feel well.) He has had a couple of growly days, but he eventually will go!
At first we gave him 200ml/day (and we still do when he gets upset). Now however, we have started to give him 100ml/every other day and that seems to be helping. He is drinking on his own (the vet tech said he might not drink on days he gets fluids, so that was nice to see) and eating/taking his medicine. Like i said before, this is not a cure, but could be a good way to deal with the problem until we can figure out what is going on. He might be on this regimen for life, but it's worth it if we get to keep him happy and healthy!