Part 52: The Economics of Longevity

Top 20 Cost-Effective Medicines by Half-Life (Expanded Edition)

This article is part of the Substance Use Education India series. All prices are calculated from the expanded official PMBJP product list (May 2026).

If you or someone you know is struggling with substance dependence, contact the National Drug De-Addiction Helpline: 14446

In this updated educational analysis, we have expanded our scope to over 350 generic formulations. We evaluate medications based on their Cost-Effectiveness Index (CEI), which measures “Hours of Duration per Rupee Spent.”

A high CEI indicates a substance that is both extremely cheap and stays in the body for a very long time—a combination that increases the risk of chronic accumulation and physical dependence.

Top 20 Value Rankings (Sorted by CEI)

Rank	Substance	Half-Life (Avg)	Daily Dose	Daily Cost (Rs)	CEI (Value Index)
1	Fluoxetine	100 hrs*	20 mg	₹0.83	120.5
2	Phenobarbitone	100 hrs	60 mg	₹1.06	94.3
3	Diazepam	50 hrs	5 mg	₹0.56	89.3
4	Nitrazepam	30 hrs	5 mg	₹0.42	71.4
5	Clonazepam	34 hrs	0.5 mg	₹0.52	65.4
6	Chlordiazepoxide	100 hrs*	10 mg	₹1.97	50.7
7	Amitriptyline	20 hrs	10 mg	₹0.62	32.2
8	Escitalopram	30 hrs	10 mg	₹0.94	31.9
9	Hydroxyzine	22 hrs	10 mg	₹0.72	30.5
10	Alprazolam	11 hrs	0.25 mg	₹0.41	26.8
11	Risperidone	20 hrs	2 mg	₹0.94	21.3
12	Trihexyphenidyl	12 hrs	2 mg	₹0.62	19.3
13	Promethazine	12 hrs	25 mg	₹0.66	18.1
14	Sertraline	26 hrs	50 mg	₹1.69	15.4
15	Lorazepam	15 hrs	1 mg	₹1.03	14.5
16	Clobazam	18 hrs	5 mg	₹1.41	12.8
17	Carbamazepine	15 hrs	200 mg	₹1.41	10.6
18	Tramadol	6.5 hrs	50 mg	₹0.75	8.6
19	Quetiapine	7 hrs	25 mg	₹1.03	6.8
20	Valproate	12 hrs	500 mg	₹2.06	5.8

*Includes active metabolites (e.g., Norfluoxetine for Fluoxetine).

---

Notable Findings in the Expanded List

The Fluoxetine Phenomenon (Rank #1)

With the inclusion of the full CNS portfolio, Fluoxetine emerges as the highest “value” drug. While it is an antidepressant (SSRI) and not a primary sedative, its active metabolite Norfluoxetine stays in the body for up to 16 days. At just ₹0.83 per dose, it has the lowest clearance rate per rupee of any drug in the Jan Aushadhi catalogue.

The Antipsychotic Value Index

Drugs like Risperidone and Quetiapine show moderate CEI values. While they are not classically “euphoric,” their sedating side effects are often exploited by those seeking cheap relief from insomnia or anxiety, especially given their low cost (₹0.94–₹1.03 per dose).

Benzodiazepine Consistency

The “Big Four” (Diazepam, Nitrazepam, Clonazepam, Alprazolam) remain in the top 10. Their high half-lives relative to their sub-rupee pricing make them the primary substances of concern for long-term dependence in the Indian market.

---

Conclusion: The Accumulation Risk

The CEI is more than just a number; it represents a toxicity risk. A drug with a high CEI is difficult to “wash out” of the system. If a user takes another dose before the first one has cleared (which, for Rank #1-5, takes weeks), the drug levels in the blood will eventually reach toxic or lethal concentrations.

Education on half-life is the most effective tool in preventing the “stacking” effect that leads to many unintentional overdose deaths in the community.

---

Continue to: Part 51A: Opioids & Benzos MRP Guide | Part 51B: Gabapentinoids & Stimulants MRP Guide | Part 51C: Antidepressants & Steroids MRP Guide

---

Disclaimer: This series is purely educational. If you or a loved one are struggling with addiction, please reach out to the professional help resources listed above. Dosages and prices are indicative based on Jan Aushadhi (PMBJP) 2024 records.

View Full Jan Aushadhi MRP List