


Penflu 40 mg Injection
Written By Dr. Sakshi Jain, MS, BDS,
Reviewed By Dr. Rajeev Sharma, MBA, MBBS,
Last updated on 31 Mar 2026 | 02:28 PM (IST)
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Product introduction
Penflu 40 mg Injection is administered as an injection under the supervision of medical supervision. It is given in cases where oral administration is not possible. 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. It is important that this medication is not stopped suddenly without talking to your doctor as it may worsen your symptoms.
Some common side effects of this medicine include dry mouth, constipation, urinary retention, blurred vision, increased heart rate, muscle rigidity, restlessness, and tremor. Initially, this medicine may cause a sudden drop in blood pressure when you change positions, rise slowly if you have been sitting or lying down. It may also cause dizziness and sleepiness, do not drive or do anything that requires mental focus until you know how this medicine affects you.
Before taking it, inform your doctor if you are suffering from thyroid or kidney disease, epilepsy, Parkinson’s disease, glaucoma, or any heart disease. You should not take this medicine if you are under the influence of alcohol or any sleep-inducing, cough, and/ or allergy medication. This medicine can also lead to weight gain, eat a healthy balanced diet, avoid snacking with high-calorie food, and exercise regularly.
Uses of Penflu Injection
Benefits of Penflu Injection
Penflu 40 mg Injection is a combination medicine that helps in maintaining the balance of certain chemicals in the brain that affect mood and behavior. This improves your mood, relieves anxiety, tension, helps you sleep better and increases your energy levels. Penflu 40 mg Injection prevents extreme changes in mood and helps you feel less agitated. You may experience fewer episodes of depression and low mood.
It can take several weeks for this medicine to work and you may still feel low during this time. It is likely that you will take this medicine for at least six months but possibly much longer. It needs to be taken regularly to work effectively. Do not stop taking it unless your doctor tells you to.
Side effects of Penflu Injection
- Constipation
- Urinary retention
- Weight gain
- Sleepiness
- Orthostatic hypotension (sudden lowering of blood pressure on standing)
- Increased heart rate
- Increased prolactin level in blood
- Blurred vision
- Dryness in mouth
- Muscle stiffness
- Tremors
- Restlessness
How to use Penflu Injection
How Penflu Injection works
Quick tips
- Penflu 40 mg Injection helps treat anxiety and depression.
- Use caution while driving or doing anything that requires concentration as Penflu 40 mg Injection can cause dizziness and sleepiness.
- Avoid drinking alcohol while taking this medicine because it can make drowsiness worse.
- It can cause changes in your blood sugar levels. Monitor your blood sugar regularly.
- Inform your doctor if you have liver disease, thyroid disorder, severe heart disease, or a urinary disorder.
- Talk to your doctor if you notice sudden mood changes or develop suicidal thoughts.
- Let your doctor know you are taking Penflu 40 mg Injection before undergoing any surgical procedure.
Safety advice

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- CBC (Complete Blood Count)
- FBS (Fasting Blood Sugar)
- Thyroid Profile Total (T3, T4 & TSH)
- HbA1c (Glycosylated Hemoglobin)
- PPBS (Postprandial Blood Sugar)
- Lipid Profile
- Vitamin D (25-Hydroxy)
- Urine R/M (Urine Routine & Microscopy)
- Coronavirus Covid -19 test- RT PCR
- LFT (Liver Function Test)
- KFT (Kidney Function Test)
- TSH (Thyroid Stimulating Hormone) Ultrasensitive
- ESR (Erythrocyte Sedimentation Rate)
- Uric Acid, Serum
- Vitamin B12
- CRP (C-Reactive Protein), Quantitative
- Urine C/S (Urine Culture and Sensitivity)
- Serum Electrolytes
- Serum Calcium
- Serum Creatinine
- Diabetes Screening (HbA1C & Fasting Sugar)
- KFT with Electrolytes (Kidney Function Test with Electrolytes)
- Cholesterol - Total
- Hb (Hemoglobin)
- Complete Hemogram (CBC & ESR)















