You are not in the obese category at 5.2 and 10 stones. And yes all drugs have side effects, but not many have cancer as the first one listed.
And one should consider alternatives. Do you have to take the drug or is there a better way to lose those pounds for your holiday that doesn't involve cancer, kidney failure, gallstones,... Don't say you are doing it so you lessen you cancer risk. More like for vanity, fair enough to want to lose and look better, but at the cost of health down the line....
If you really want to lose weight AND reduce your cancer risk , just take a big black bin bag, and ditch all the snacks, chips, cookies, white bread, sauce jars, and fill the fridge with celery, carrots, cucumber, kale and tomatoes. These will reduce your risk cancer far more than the small excess weight you have. And also giver you a great skin the second you step in the sun.
You will also find out that after losing the first 5% of bodyweight , the effects stop, and a year after, all those on trials have regained the weight once they stopped the drug but the health issues remained ....
english.prescrire.org/en/81/168/51641/0/NewsDetails.aspx
Do as you please but don't promote it here.