a non-GAAP financial measure. For a reconciliation of net sales to gross billings, see the section titled “Reconciliation of Non-GAAP Financial Measures” below.
Prescription Medicines sales consist of sales of Stendra® in the U.S. for the treatment of male ED. Stendra® is primarily sold directly to the four main customers as described above, which collectively accounted for approximately 92% of Stendra® net sales for the six months ended June 30, 2023. Individually, sales to the four main customers, accounted for 33%, 24%, 22%, and 14%, respectively, of Stendra® gross billings for the six months ended June 30, 2023.
Medical Device sales consist of domestic and international sales of men’s health products for the treatment of ED. The men’s health products do not require a prescription and include Vacuum Erection Devices (“VEDs and related accessories”).
Net sales were $2,139,702 or 32% lower during the six months ended June 30, 2023 compared to the same period in 2022 consisting of a $2,366,255 decrease in the net sales of Stendra® and a $226,553 increase in Medical Device Sales. The decrease in net sales of Stendra® was substantially due to decreased wholesaler sales due to decreased demand and decreased related sales allowances stemming from a reduction in promotional activities. The increase in net sales for Medical Devices included an increase in domestic sales of VED systems and an increase in international sales of VED systems.
Cost of Sales
Cost of sales for the six months ended June 30, 2022, were $1,064,599, composed of $257,721 of cost of sales for our Prescription Medicines segment and $806,878 for our Medical Devices segment.
Cost of sales for the six months ended June 30, 2022, were $1,121,560, composed of $489,007 of cost of sales for our Prescription Medicines segment and $632,553 for our Medical Devices segment.
Cost of sales for the Prescription Medicine segment for the six months ended June 30, 2023 consisted of 48% royalty expenses, 35% third-party product cost of sales, 16% inventory obsolescence reserves and 1% 3PL order fulfillment and shipping expenses.
Cost of sales for the Medical Device segment for the six months ended June 30, 2022 consisted of 85% raw materials and 15% production labor.
Cost of sales decreased by $56,961 or 5% during the six months ended June 30, 2023 compared to the same period in 2022. For the six months ended June 30, 2023 and 2022, cost of sales as a percentage of net sales was 24% and 17%, respectively. The increase in cost of sales as a percentage of net sales was a result of increased sales order fulfillment costs (on a per unit basis) during the six months ended June 30, 2023 compared to the same period in 2022
Gross Profit
Gross profit for the six months ended June 30, 2023 was $3,447,384, or 76% of net sales, composed of $2,232,965 of gross profit from Prescription Medicines and $1,214,419 from Medical Devices. Gross profit for the six months ended June 30, 2022 was $5,530,125, or 83% of net sales, composed of $4,367,934 of gross profit from Prescription Medicines and $1,162,191 from Medical Devices. The increase in gross profit was driven by the factors noted above.
Operating Expenses
Selling, general and administrative
Selling, general and administrative expenses for the six months ended June 30, 2023, were $4,380,231, composed of $754,993 of selling, general and administrative expenses of our Prescription Medicines segment, $905,442 of selling, general and administrative expenses of our Medical Devices segment and $2,719,796 of general corporate expenses.
Selling, general and administrative expenses for the six months ended June 30, 2022, were $7,114,342, composed of $3,440,168 of selling, general and administrative expenses of our Prescription Medicines segment, $884,538 of selling, general and administrative expenses of our Medical Devices segment and $2,789,636 of general corporate expenses.