AMPH (Amphastar Pharmaceuticals) Effective Interest Rate on Debt %: 3.91% (As of Mar. 2026)


AMPH Amphastar Pharmaceuticals Inc AMPH
83 GF Score
Price $19.66
GF Value $48.81
Valuation Significantly Undervalued
! 4 Warning Signs
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What is Amphastar Pharmaceuticals Effective Interest Rate on Debt %?

Amphastar Pharmaceuticals AMPH -2.29% 83 Effective Interest Rate on Debt % is 3.91% as of Mar. 2026. GuruFocus rates AMPH with a GF Score™ of 83/100 and a GF Value™ of $48.81 (Significantly Undervalued). The stock has 4 warning signs investors should review.

Effective Interest Rate on Debt % is the usage rate that a borrower actually pays on a debt. It is calculated as the positive value of Interest Expense divided by its average total debt. Total debt equals to Long-Term Debt & Capital Lease Obligation plus Short-Term Debt & Capital Lease Obligation. Amphastar Pharmaceuticals's annualized positive value of Interest Expense for the quarter that ended in Mar. 2026 was $26.2 Mil. Amphastar Pharmaceuticals's average total debt for the quarter that ended in Mar. 2026 was $671.2 Mil. Therefore, Amphastar Pharmaceuticals's annualized Effective Interest Rate on Debt % for the quarter that ended in Mar. 2026 was 3.91%.


Amphastar Pharmaceuticals  (NAS:AMPH) Effective Interest Rate on Debt % Explanation

Effective Interest Rate on Debt % measures the usage rate that a borrower actually pays on a debt.


Amphastar Pharmaceuticals Effective Interest Rate on Debt % Related Terms


Amphastar Pharmaceuticals Effective Interest Rate on Debt % Historical Data

* Premium members only.

The historical data trend for Amphastar Pharmaceuticals's Effective Interest Rate on Debt % can be seen below:

* For Operating Data section: All numbers are indicated by the unit behind each term and all currency related amount are in USD.
* For other sections: All numbers are in millions except for per share data, ratio, and percentage. All currency related amount are indicated in the company's associated stock exchange currency.

Amphastar Pharmaceuticals Effective Interest Rate on Debt % Chart

Amphastar Pharmaceuticals Annual Data
Trend Dec16 Dec17 Dec18 Dec19 Dec20 Dec21 Dec22 Dec23 Dec24 Dec25
Effective Interest Rate on Debt %
Get a 7-Day Free Trial Premium Member Only Premium Member Only 1.03 1.78 7.48 4.76 3.90

Amphastar Pharmaceuticals Quarterly Data
Jun21 Sep21 Dec21 Mar22 Jun22 Sep22 Dec22 Mar23 Jun23 Sep23 Dec23 Mar24 Jun24 Sep24 Dec24 Mar25 Jun25 Sep25 Dec25 Mar26
Effective Interest Rate on Debt % Get a 7-Day Free Trial Premium Member Only Premium Member Only Premium Member Only Premium Member Only Premium Member Only Premium Member Only Premium Member Only Premium Member Only Premium Member Only Premium Member Only Premium Member Only Premium Member Only 3.86 3.84 3.83 4.04 3.91

AMPH vs ETON, PCRX, BIOA: Effective Interest Rate on Debt % Comparison

For the Drug Manufacturers - Specialty & Generic subindustry, Amphastar Pharmaceuticals's Effective Interest Rate on Debt %, along with its competitors' market caps and Effective Interest Rate on Debt % data, can be viewed below:

* Competitive companies are chosen from companies within the same industry, with headquarter located in same country, with closest market capitalization; x-axis shows the market cap, and y-axis shows the term value; the bigger the dot, the larger the market cap. Note that "N/A" values will not show up in the chart.


Amphastar Pharmaceuticals Effective Interest Rate on Debt % vs Drug Manufacturers Industry

For the Drug Manufacturers industry and Healthcare sector, Amphastar Pharmaceuticals's Effective Interest Rate on Debt % distribution charts can be found below:

* The bar in red indicates where Amphastar Pharmaceuticals's Effective Interest Rate on Debt % falls into.


AMPH
83GF Score
Amphastar Pharmaceuticals Inc AMPH
Effective Interest Rate on Debt % is just one metric. See GF Score™, valuation, warning signs, and more.
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Amphastar Pharmaceuticals Effective Interest Rate on Debt % Calculation

Amphastar Pharmaceuticals's annualized Effective Interest Rate on Debt % for the fiscal year that ended in Dec. 2025 is calculated as

Effective Interest Rate on Debt %
=-1  *  Interest Expense/( (Total Debt  (A: Dec. 2024 )+Total Debt  (A: Dec. 2025 ))/ count )
=-1  *  -25.481/( (650.549+656.002)/ 2 )
=-1  *  -25.481/653.2755
=3.90 %

where

Total Debt  (A: Dec. 2024 )
=Long-Term Debt & Capital Lease Obligation + Short-Term Debt & Capital Lease Obligation
=643.511 + 7.038
=650.549

Total Debt  (A: Dec. 2025 )
=Long-Term Debt & Capital Lease Obligation + Short-Term Debt & Capital Lease Obligation
=646.433 + 9.569
=656.002

Amphastar Pharmaceuticals's annualized Effective Interest Rate on Debt % for the quarter that ended in Mar. 2026 is calculated as

Effective Interest Rate on Debt %
=-1  *  Interest Expense/( (Total Debt  (Q: Dec. 2025 )+Total Debt  (Q: Mar. 2026 ))/ count )
=-1  *  -26.212/( (656.002+686.378)/ 2 )
=-1  *  -26.212/671.19
=3.91 %

where

Total Debt  (Q: Dec. 2025 )
=Long-Term Debt & Capital Lease Obligation + Short-Term Debt & Capital Lease Obligation
=646.433 + 9.569
=656.002

Total Debt  (Q: Mar. 2026 )
=Long-Term Debt & Capital Lease Obligation + Short-Term Debt & Capital Lease Obligation
=675.002 + 11.376
=686.378

* For Operating Data section: All numbers are indicated by the unit behind each term and all currency related amount are in USD.
* For other sections: All numbers are in millions except for per share data, ratio, and percentage. All currency related amount are indicated in the company's associated stock exchange currency.

In the calculation of annual Effective Interest Rate on Debt %, the Interest Expense of the last fiscal year and the average total debt over the fiscal year are used. In calculating the quarterly data, the Interest Expense data used here is four times the quarterly (Mar. 2026) interest expense data. Effective Interest Rate on Debt % is displayed in the 30-year financial page.

What does a Effective Interest Rate on Debt % of 3.91% mean?
Amphastar Pharmaceuticals (AMPH) has a Effective Interest Rate on Debt % of 3.91% as of Mar. 2026. Effective interest rate on debt is the rate a company actually pays on its debt. View historical data on Amphastar Pharmaceuticals and its competitors.
Is Amphastar Pharmaceuticals' Effective Interest Rate on Debt % too high?
Amphastar Pharmaceuticals' current Effective Interest Rate on Debt % is 3.91%. Overall, Amphastar Pharmaceuticals has a GF Score™ of 83/100 and is considered Significantly Undervalued, reflecting its overall financial health beyond just this single metric.
How does Amphastar Pharmaceuticals' Effective Interest Rate on Debt % compare to ETON and PCRX?
Amphastar Pharmaceuticals' Effective Interest Rate on Debt % of 3.91% can be compared against companies in the Drug Manufacturers industry. See the competitive comparison table and distribution chart on this page for a detailed peer-by-peer breakdown.
What is a good Effective Interest Rate on Debt % for a Drug Manufacturers company?
A good Effective Interest Rate on Debt % depends on the Drug Manufacturers industry context. However, Effective Interest Rate on Debt % should not be evaluated in isolation — investors should consider it alongside profitability, growth, and financial strength metrics. Use the industry distribution chart on this page to see where any company falls relative to its peers.
What does a high Effective Interest Rate on Debt % mean?
A high Effective Interest Rate on Debt % can signal that a stock is expensive relative to its fundamentals. Effective interest rate on debt is the rate a company actually pays on its debt. View historical data on Amphastar Pharmaceuticals and its competitors. Amphastar Pharmaceuticals's current Effective Interest Rate on Debt % is 3.91%. However, context matters — high-growth companies often justify higher valuations. Always evaluate alongside other metrics like GF Score™ and GF Value™.
Is Amphastar Pharmaceuticals stock overvalued right now?
Based on GuruFocus' analysis, Amphastar Pharmaceuticals (AMPH) is currently considered Significantly Undervalued. The stock's GF Value™ is $48.81, compared to a current price of $19.66 — trading 59.7% below its estimated fair value. The current Effective Interest Rate on Debt % is 3.91%. Amphastar Pharmaceuticals' overall GF Score™ is 83/100 with 4 warning signs to review. Investors should evaluate multiple metrics — including profitability, growth, and financial strength — before making a decision.
How is Effective Interest Rate on Debt % calculated?
Effective Interest Rate on Debt % is calculated from a company's financial statements. For Amphastar Pharmaceuticals (AMPH), the current Effective Interest Rate on Debt % is 3.91% as of Mar. 2026. GuruFocus calculates this using data sourced from SEC filings and annual reports. See the calculation section and 30-year financial data on this page for the full breakdown.

Is Amphastar Pharmaceuticals (AMPH) Overvalued in 2026?

Based on GuruFocus' analysis, Amphastar Pharmaceuticals stock appears to be undervalued. The current stock price of $19.66 is trading 59.7% below its estimated GF Value™ of $48.81. GuruFocus considers Amphastar Pharmaceuticals to be Significantly Undervalued.

Key valuation signals for AMPH:

  • Effective Interest Rate on Debt %: 3.91%
  • GF Value™: $48.81 vs. price of $19.66 (59.7% below fair value)
  • GF Score™: 83/100 with 4 warning signs

No single metric tells the full story. See the AMPH stock analysis page for a complete view including 30-year financials, guru trades, and insider activity.


Amphastar Pharmaceuticals Business Description

Other Exchanges 29A:Germany
Address 11570 6th Street, Rancho Cucamonga, CA, USA, 91730
Amphastar Pharmaceuticals Inc is a bio-pharmaceutical company focusing on developing, manufacturing, marketing, and selling technically challenging generic and proprietary injectable, inhalation, and intranasal products, as well as insulin active pharmaceutical ingredient (or insulin API products. The company's finished products are used in hospital or urgent care clinical settings and are contracted and distributed through group purchasing organizations and drug wholesalers. The company has one reportable segment: pharmaceutical products. Geographically, the business presence of the firm is seen in the United States, China, and France, of which the U.S. accounts for the majority of the revenue.
83GF Score

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Effective Interest Rate on Debt % is just one metric. See GF Value™, 30-year financials, guru trades, warning signs, and more.

$19.66
Price
$48.81
GF Value