Explain all your earlier and current clinical details with your doctor before commencing treatment. If you are taking any herbal supplements or over the counter medication, including vitamin pills, then discuss it with your doctor. Please state to your doctor if you have undergone medical conditions like eye or vision problems, including a rare inherited eye condition known as retinitis pigmentosa, a history of heart attack, or other heart problems, angina, high or low blood pressure, stroke, kidney disease, liver disease. Mention if you are allergic to sildenafil or other medicines, foods, dyes, or preservatives.

Doctors warn on using Kamagra Oral Jelly if you are allergic to any element in it or if you take any of the following:
Cisapride
Methscopolamine nitrate
Nitrates such as isosorbide dinitrate, amyl nitrite, isosorbide mononitrate, nitroglycerin, nitroprusside
Other sildenafil products (Caverta, Viagra, Revatio, etc.)

It also reacts with other medicines like:
Cimetidine
Rifampin
Erythromycin
Some drugs for high blood pressure
Several drugs for the treatment of HIV infection or AIDS
Specific drugs used for fungal or yeast infections, like fluconazole, itraconazole, ketoconazole, and voriconazole
This drug does not limit the spread of HIV or other STDs. It also does not help to stop pregnancy.
If you appear to have any changes in your eyesight then you should reach your doctor immediately.

The medicine sometimes may cause an extended and painful erection. Contact your doctor promptly if the erection lasts for more than 4 hours as it can lead to permanent sexual dysfunctions like impotence.

In case you have indications of dizziness, nausea, chest pain, or arm pain while having sex, terminate the activity. Reach your doctor as soon as possible.