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If you take prescription medication, talk with your doctor about the safety of combining these treatments

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Updated on July 23rd, 2026

Key Dietary Tips While Taking Phentermine: Limit Caffeine: Phentermine can increase your energy and alertness, so adding large amounts of caffeine (from coffee, tea, energy drinks, or sodas) can heighten side effects like nervousness, jitteriness, elevated heart rate, or high blood pressure

[DOI] [PubMed] [Google Scholar] 148.Zhang K, Shen X, Wu J, Sakaki K, Saunders T, Rutkowski DT, et al

In post-marketing experience, angioedema and angioedema-like reactions were reported with parenteral methylcobalamin