Daniel BrÃ¼hl and Luke Evans have been cast in key roles in TNT's The Alienist. Daniel BrÃ¼hl and Luke Evans have been cast in key roles in TNT's The Alienist. Click to Skip Ad
Side Effects. Drontal has very few side effects and is generally safe. Some cats may vomit after receiving the dewormer. Rarely, a cat might appear disoriented or wobble around for a short time after taking Drontal. If your cat exhibits any side effects, call your veterinarian.
Over-the-counter antacids like Maalox and Mylanta help neutralize stomach acid, but may cause diarrhea or constipation. H2 receptor antagonists (H2RAs), such as Zantac and Pepcid, work to reduce stomach acid. Side effects of these medications include: 1  nausea. 2  vomiting. 3  diarrhea. 4  rash or itching. 5  constipation. 6  headache.