Combining L-citrulline and Cialis can increase the risk of certain side effects. Always consult your doctor before starting any new supplement regimen, especially if you have pre-existing health conditions.
Cardiovascular Effects
Both L-citrulline and Cialis can affect blood pressure. L-citrulline, by increasing nitric oxide, can lower blood pressure. Cialis, a vasodilator, also lowers blood pressure. Combining them may cause a significant drop in blood pressure, leading to dizziness, lightheadedness, or fainting. Individuals with low blood pressure or heart conditions should exercise extreme caution.
Headache and Flushing
- Increased nitric oxide from L-citrulline can cause headaches in some individuals. Cialis frequently causes flushing (redness of the skin). The combined effect might intensify these side effects.
Gastrointestinal Issues
While generally well-tolerated, L-citrulline can sometimes cause mild gastrointestinal upset, such as nausea or diarrhea, in some individuals. Combining this with Cialis, which may also have gastrointestinal effects in some cases, could potentially worsen these issues.
Drug Interactions
Cialis interacts with numerous medications. Discuss all medications and supplements you are taking with your physician before combining them with L-citrulline and Cialis. Some medications, particularly those affecting blood pressure or nitrates, should never be combined with Cialis due to potentially serious interactions.
Dosage Considerations
Start with a low dose of both L-citrulline and Cialis, and monitor your body’s response closely. Gradually increase dosage only under the strict supervision of a healthcare professional, if necessary.
Monitoring and Discontinuing
If you experience any unusual side effects, immediately discontinue use and seek medical attention. Regular monitoring of your blood pressure and overall health is advisable while taking both substances.


