I can sympathise with your friend, I to suffer from heartburn, and I know its not a pleasant thing to go through.
Like Ellieyan I agree that it is important to stick to your diet and stay away from the trigger foods, but that isnt always achievable 100% of the time either.
I came across a product on the web, from my country actually, New Zealand called Zylax. I have been taking Zylax for just three weeks now but have already noticed an improvement in my heartburn.
Zylax is a completely natural capsule product, and is based on a digestive enzyme complex extracted from kiwifruit. I have been told that this product works on the basis that ONE of the reasons for dysfunctional digestion issues such as Heartburn or GERD developing is the incomplete break down of the food that we eat.
Zylax therefore they tell me is designed to help ensure that you digest or breakdown the food that you eat properly, which not only means you get maximum benefit from your food, but you help to prevent and treat symptoms of dysfunctional digestion such as heartburn or GERD.
I started off taking two capsules before each meal - and have just recently reduced to just two capsules a day.
I have also noticed that if I take a capsule when I notice a particuarly bad attack of heartburn that I have some relief usually within 30 minutes of taking a capsule.
However it is important to note that this is not a drug, and that results do vary from person to person, but it could be another option to try.