Drug Information
Summary of Interactions with Vitamins, Herbs, & Foods
Types of interactions:BeneficialAdverseCheck
Replenish Depleted Nutrients
Potential Negative Interaction
Ephedra is the plant from which the drug ephedrine was originally isolated. Phenylpropanolamine and ephedrine have similar effects and side effects. Until 2004, ephedra, also called ma huang, was used in many herbal products including supplements promoted for weight loss.
While interactions between phenylpropanolamine and ephedra have not been reported, it seems likely that such interactions could occur. To prevent potential problems, people taking phenylpropanolamine-containing products should avoid using ephedra/ephedrine-containing products.
The interaction is supported by preliminary, weak, fragmentary, and/or contradictory scientific evidence.
Antihistamines, including clemastine, can cause “anticholinergic” side effects such as dryness of mouth and heart palpitations. Henbane (Hyoscyamus niger)also has anticholinergic activity and side effects. Therefore, use with clemastine could increase the risk of anticholinergic side effects, though apparently no interactions have yet been reported with clemastine and henbane. Henbane should not be taken except by prescription from a physician trained in its use, as it is extremely toxic.
The interaction is supported by preliminary, weak, fragmentary, and/or contradictory scientific evidence.
Explanation Required
- Fo-Ti
Many drugs used in the treatment of high blood pressure cause relaxation or dilation of blood vessels. Laboratory studies show that emodin, a compound in Polygonum multiflorum, also relaxes blood vessels. However, animal studies reveal that phenylephrine blocks the action of emodin. Controlled studies are needed to determine whether Polygonum multiflorum helps people with high blood pressure and whether phenylephrine blocks its beneficial effects.
The interaction is supported by preliminary, weak, fragmentary, and/or contradictory scientific evidence.
The Drug-Nutrient Interactions table may not include every possible interaction. Taking medicines with meals, on an empty stomach, or with alcohol may influence their effects. For details, refer to the manufacturers’ package information as these are not covered in this table. If you take medications, always discuss the potential risks and benefits of adding a new supplement with your doctor or pharmacist.
