Not only can medications influence each other, but also foods, drinks, and dietary supplements can alter the effects of individual medications. The Austrian health portal explicitly points out that such interactions are possible and that information about them can also be found in the respective medication’s instructions for use.

Grapefruit is particularly well-known. Certain components of the fruit can influence enzymes involved in the breakdown of various medications. This can change the concentration of some active substances in the body. However, which medications are actually affected depends on the specific preparation.

The interaction with grapefruit can lead to certain medications having a stronger or longer effect. Therefore, for medications known to interact with grapefruit, grapefruit or grapefruit juice should be avoided according to the medication information.

It is important to note: Not every medication is affected. The specific active ingredient and the information in the instructions for use are always decisive.

Milk and dairy products can also play a role. The calcium they contain can influence the absorption of certain medications from the gastrointestinal tract.

This effect is known with some antibiotics. A time gap from calcium intake can also be important for certain thyroid medications and osteoporosis treatments.

The necessary gap depends on the specific preparation. Therefore, the intake instructions of the specific medication should be followed. Calcium-rich foods can also inhibit iron absorption.

When it comes to coffee as well as black and green tea, it is particularly about the absorption of iron.

Certain ingredients such as polyphenols from tea and chlorogenic acid from coffee can reduce iron absorption. Calcium from dairy products can also slow down absorption.

Those taking an iron supplement should therefore pay attention to the recommended intake in the package insert and not automatically take it together with coffee, tea, or dairy products.

Alcohol can also interact with medications. Depending on the drug, its effect can change, or additional side effects may occur.

This is particularly relevant for medications that can themselves cause drowsiness or impair reaction ability. Therefore, the respective package insert should be observed, and in case of uncertainty, medical or pharmaceutical advice should be sought. The health portal explicitly lists alcohol as a possible trigger for undesirable interactions.

Green leafy vegetables contain a lot of vitamin K. This vitamin plays an important role in blood clotting.

For certain blood thinners, vitamin K intake can therefore be relevant. The key is not to generally avoid green vegetables, but to maintain a consistent intake and have the medication monitored accordingly by a doctor.

Important: This interaction particularly affects vitamin K-sensitive anticoagulants; not all modern blood thinners are equally affected.

St. John’s Wort can also cause interactions. Preparations with St. John’s Wort can influence the metabolism of various medications, thereby weakening or altering their effects.

Affected can be certain anticoagulants, immunosuppressants, and antidepressants, among others. There are also corresponding indications for hormonal contraceptives.

Especially with dietary supplements and herbal preparations, it should not be automatically assumed that they are compatible with medications.

The examples show: There is no general list of foods that are prohibited for all medications. An interaction depends on the specific active ingredient, the dosage, and the situation of intake.

The Austrian health information therefore recommends paying attention to the package insert and informing doctors or pharmacists about all medications, dietary supplements, and relevant dietary habits being taken.

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