Why are you recommending taking MILK with this medication ?!
It is explicitly contraindicated multiple times all over the packaging the Dulcolax website to NOT consume any dairy whatsoever within 1-2 hours of taking bisacodyl (brand name Dulcolax) or ANY antacid or acid blocker, for that matter (Prilosec, Zantac, Prevacid, etc). The milk reduces stomach acidity levels and can cause the tablet's protective coating to be "eaten" away, thereby prematurely releasing the active ingredient, which can cause acid-reflux, etc., along with associated discomforts.
I myself have only just taken this medication for the first time ever, about 3 hours ago. I did not notice the dairy contraindication downed a 1/2 pint of Haagen Dazs just after taking the tablet. However, I also took the tablet on a very full stomach have continued eating foods since taking the pill (non-dairy :-) in addition to drinking TONS of water. At the ER 2 days ago (I went precisely because of the severe worsening abdominal cramping), my blood was not at all liquid and it came out like globular jam to spread on toast my urine was almost orange. I was severely dehydrated and put on a saline drip. I felt much improved after the drip and although I am currently urinating every 15 minutes, my urine is now clear I am not feeling any ill effects of the tablet, so far.
I HAVE been feeling VERY odd for the past 2 hours, but mostly not in the belly area, aside from 30 mins of very light cramping. I've been feeling "out of it", a bit weak, with temporary trouble focussing my eyes (gone now). I'm also having some arthritic-type pain in my knees hands. Not so bad after 4 hours. I'll update tomorrow...
As I do with EVERY drug I am unfamiliar with, I began with the SMALLEST POSSIBLE DOSE, 1 tablet of 5 mg. I've never taken nor needed a laxative in all my 32 years. Since I've not got a tolerance to the drug, I assumed it most prudent to "try it out" with one pill increase the dosage tomorrow night, as necessary (if it doesn't "work" tonight).
I feel sorry for the many sufferers here, but I think American pharmaceutical culture here is also to blame. In Europe, you have to speak to the pharmacist for ALL drugs, even "just" Tylenol they immediately advise you of any peculiarities of the medicine they're giving you. They also informally share anecdotal experiences aggregated from customer feedback.
In the USA, the pill-popping culture, coupled with the ultra-capitalist pharmaceutical juggernaut, make their medicines seem risk-free, allowing consumers who may be ill-educated to self-medicate, indeed encouraging these sufferers to shove more more pills down their throats to keep the pharmaceutical industry booming. In the American mind, pills would not be OTC if they weren't "foolproof". This is FAR from reality. Even the "safest" OTC drug Tylenol (paracetemol) can kill in relatively small doses. These misled "walking wallets" buy the packaging advertising, using a product if the package convinces them the drug will "cure" the stated symptoms, as opposed to finding out what they're actually putting into their bodies and reading up on the INGREDIENTS (so easy these days on a smartphone); there are usually several options out there for you.
Laxatives, for example, come in 2 types - Dulcolax, which is actually just bisacodyl Miralax, whose active ingredient is polyethylene glycol. There's usually more than 1 option.
***And, always ASK the pharmacist for any info they may have, or "hearsay" from other customers, even for OTC meds! Pharmacists are usually VERY excited to share, as they train almost as long as doctors (6-10 years of university, they're now ALL required to obtain DOCTORATE degrees!) but wind up filling scripts all day. They are a bastion of untapped information to help you avoid unnecessary suffering!