@jim31756
I presume you're asking about taking Castor Oil.
If you meant MoM, it's very straight forward…. pour the full dose (2 Oz) into the measuring cup just before bed, drink it down, follow at once with a full glass of cold water (at least 8 Oz). You may not get a strong urge in the morning, but it should, at least, soften the poo and move it along you bowel, so if you try and go after breakfast, the trip is more likely to be ‘productive’. MoM is a mild laxative and poo softener.
Castor Oil is a very different story. It is a powerful laxative, pretty much independent of the dosage, as long as the dose is large enough to be effective. For example, 8 Oz isn't going to make someone poo more strongly than 2 Oz (but you will poo out and maybe continue to leak a lot of undigested oil).
Castor Oil is most effective given on an empty stomach. I've read that as little as 5ml can have laxative effects in adults. The usual dose is 15ml to 60ml.
It is not pleasant stuff to take because of the smell, taste, and texture. Some people just swallow the stuff and try and keep it down. If you throw it up, it won't make you poo. There are other options:
The oil can be taken very cold, either mixed with or followed by orange juice to disguise the taste. This is the usual nurses' trick from the days when Castor Oil then mighty enemas was the standard pre-op prep to clean a patient out. I'm not a fan because cold oil is more viscous and doesn't go down easily and the taste tends to ‘repeat’.
Another option, which I think makes it easier to take, is to give it in a hot, somewhat oily, drink. The Castor Oil is almost undetectable in a cup of hot chocolate (or coffee), sweetened and made with whole or evaporated milk. The mixture should be as hot as comfortable to drink, be briskly stirred, and drunk down quickly on an empty stomach. After it has been consumed, it helps to walk around for a few minutes and not to lie down else you may get some nausea. After it has been consumed, the die has been cast. You will start to poo within a couple of hours… maybe much sooner.
Another option is to mix the oil with a hot soup, like beef broth or French Onion. Either combination is a good way of getting a full dose of the oil into someone without a lot of fuss.
Regardless whether you mix with hot chocolate, coffee, or soup the oil should be equally effective. None of these tricks fully disguise the taste or oiliness, but they do greatly reduce them. And, undeniably, Castor Oil is a powerful, highly effective, rapidly acting way of making someone poo. An added feature is that is is all but impossible to overdose on it, because it's self limiting. The oil has to be digested to be laxative and, once that has happened, the pooing rapidly starts and any remaining undigested oil is simply pood out (and can be seen floating on the toilet water) along with everything else and the laxative effects subsides.
If you are constipated, even badly, and are looking for some ‘help’ to have an easy, gentle, soft, controlled poo, Castor Oil is not the stuff to take. You should not expect a full dose of Castor Oil to produce a soft, well-formed poo. It is not a laxative that can be expected to do that (in contrast with a combination of Senna and Miralax). Castor Oil makes someone poo rapidly so there is not time or fluid to soften poo. The hard poo, if Castor Oil is used for a constipated person, is simply pushed out strongly by a colon full of soft or liquid poo up higher. A dose of Castor Oil almost always starts hard and ends with the passage of lots of soupy to liquid poo and a considerable time sitting on the toilet. It will clean someone out completely and usually quickly, almost always with great urgency, but the result can be pretty uncomfortable for several hours.