Risek is pretty safe. So don't worry about taking daily. As far as Ceclor, the medical literature reports rare (I repeat, rare) incidents of hepatic (liver) toxicity. The case reported was in a small child, and after a few weeks, the child returned to normal.
If you're taking Ceclor for short-term (1 or 2 weeks) then not to worry. If you're on it chronically, for some reason, then a periodic liver function test may be recommended.
Have your cousin ask his/her doctor

Hi!! I am having a heartburn right now due to GERD. I am already taking Risek, however it is still hurts sometimes..what would be the best remedy that could help Risek during the time that I am encountering a heartburn? Thanks!

Increasing the dose may help. For example, if you're taking 20 mg daily, double up to 40 mg. Also, twice-a-day dosing may be warranted, if the pain continues: 40 mg A.M. and 40 mg P.M.
But before casually increasing the dose you may want to think about avoiding foods and beverages that can aggravate GERD.
Be well.

Using Mylanta 3-4 times a day may also work to relieve your heart burn associated with GERD.