Onyx 2.5mg Tablet MD may be taken with or without food. However, it is advised to take it at the same time each day as this helps to maintain a consistent level of medicine in the body. Take this medicine in the dose and duration as advised by your doctor and if you have missed a dose, take it as soon as you remember. This medication mustn't be stopped suddenly without talking to your doctor as it may worsen your symptoms.

Some common side effects of this medicine include dryness in the mouth, constipation, muscle rigidity, and restlessness. Initially, this medicine may cause a sudden drop in blood pressure when you change positions, so it is better to rise slowly if you have been sitting or lying down. It also causes dizziness and sleepiness, so do not drive or do anything that requires mental focus until you know how this medicine affects you.

However, this medicine may increase your weight, blood sugar, and cholesterol levels but, modifying your lifestyle by having a healthy diet and exercising regularly can reduce this side effect. You should be cautious as in rare cases it may cause serious side effects like very high blood sugar levels or seizures.