Tweet. There are no known adverse reactions between Plavix (Clopidogrel) and eating grapefruit, or drinking grapefruit juice. Furthermore, there is no sufficient evidence that illustrates grapefruit juice, or the fruit itself would interfere with the effectiveness of Plavix.
Other, more minor side effects include constipation, headache, dry mouth and insomnia (because the chemicals in these drugs also influence sleep patterns). Herbal diet pills, even though they're all natural, can have potentially dangerous side effects depending upon their ingredients.
What are the warnings and side effects of amitriptyline? The most common side effects of amitriptyline include drowsiness, weight gain, dry mouth, constipation, sedation, and blurred vision. In one study, about 60 percent of the patients reported gaining weight, with an average gain of almost 12 pounds. Alcohol may increase the sedative effects of this drug.