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.
Long-Term Effects of Painkillers. There are a number of unpleasant side effects associated with painkiller abuse. Mild side effects include nausea, vomiting, and diarrhea, usually caused by the way the drug interacts with opioid receptors along the digestive tract.he long-term effects also depend on how the drug is taken. Crushing and injecting the tablet into the bloodstream can cause long-term heart damage and other cardiovascular issues, and can increase the likelihood of a heart attack.