Pelargonium Sidoides: Side Effects, Contraindications, and Safety Profile

Pelargonium sidoides, known as Umckaloabo, Kalwerbossie, or South African geranium, is a medicinal plant native to South Africa widely used for respiratory infections including colds, flu, acute bronchitis, sore throat, and pharyngitis. While effective, it carries potential side effects and contraindications that users should understand.

Plant Description

This geranium-like plant grows in a rosette form with dark roots up to 15 cm long, heart-shaped leaves, and dark red to reddish-black flowers. The extract contains tannins, flavonoids, phenolic acids, coumarins, and unique oligomeric prodelphinidins that boost secretory immunoglobulin A, enhancing mucosal immunity against viral infections.

Traditional Uses

African tribes (Basuto, Zulu, Mfengu, Xhosa) have used it for diarrhea, dysentery, fatigue, wounds, gastritis, respiratory infections, and tuberculosis. Modern commercial preparations are clinically approved in many countries for acute bronchial infections in children and adolescents.

Common Side Effects

• Heartburn and nausea
• Changes in bowel movements, mild to moderate diarrhea
• Allergic reactions: skin rashes, breathing difficulties, abnormal heart rate, hives, dizziness, headaches

Serious Risks and Contraindications

• Overdose symptoms: Severe nausea, stomach pain, abnormal palpitation, unconsciousness – requires immediate hospitalization.
• Pregnancy: Not recommended by medical practitioners.
• Kidney or liver disease: Strictly prohibited for patients with these conditions.
• Drug interactions: May interact with medications; consult healthcare provider before use.

Antimicrobial Properties

The extract shows activity against Mycobacterium and Staphylococcus aureus, contributing to its antimycobacterial effects for tuberculosis treatment. Its immune-modulating and antibacterial properties make it effective against both viral and bacterial respiratory pathogens.

Important: Use only under medical supervision. Discontinue and seek immediate care for severe reactions. This herb's potency requires respect for its contraindications and potential adverse effects.