If Fildena Chewable 100 mg contains sildenafil, alcohol is best limited or avoided because both can contribute to dizziness and lower blood pressure. Sildenafil itself can lower blood pressure, and the official prescribing information advises caution with medicines and situations that can add to this effect. Interestingly, a controlled study found that 50 mg sildenafil did not significantly increase alcohol's blood-pressure-lowering effect in healthy volunteers who reached a blood alcohol concentration of about 0.08%. However, the study did not evaluate the maximum 100 mg dose, so those findings should not be assumed to apply fully to Fildena 100 mg. Practical point: Avoid heavy alcohol intake around the time you use sildenafil, particularly if you have low blood pressure, cardiovascular disease, or take blood-pressure medicines. Seek medical help for fainting, severe dizziness, chest pain, or an erection lasting more than 4 hours.